CBSE > Class 12 > Mathematics | CBSE Board | Homework Help

x=1/4 Use arctan a + arctan b = arctan (a+b/1-ab) Compare the terms inside inverse. You will get a quadratic. Reject the answer which is negative since identy used above is for positive and ab<1.

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Find the vector equation of the line which passes through the points 3 4 5 and is parallel to the vector 2i + 2 J - 3 k

Posted by Divyansh Solanki 6 years, 3 months ago

CBSE > Class 12 > Mathematics

0 answers

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find dy/dx of y=xpowery

Posted by Sachin Singh 6 years, 3 months ago

CBSE > Class 12 > Mathematics

0 answers

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4x-3y=3 3x-5y=7

Posted by Sarkar Gupta 6 years, 3 months ago

CBSE > Class 12 > Mathematics

2 answers

Sia ? 6 years, 3 months ago

Matrix form of given equations is AX = B

{tex}\Rightarrow \left[ {\begin{array}{*{20}{c}} 4&{ - 3} \\ 3&{ - 5} \end{array}} \right]\left[ {\begin{array}{*{20}{c}} x \\ y \end{array}} \right] = \left[ {\begin{array}{*{20}{c}} 3 \\ 7 \end{array}} \right]{/tex}

Here {tex}A = \left[ {\begin{array}{*{20}{c}} 4&{ - 3} \\ 3&{ - 5} \end{array}} \right],X = \left[ {\begin{array}{*{20}{c}} x \\ y \end{array}} \right]{/tex} and {tex}B = \left[ {\begin{array}{*{20}{c}} 3 \\ 7 \end{array}} \right]{/tex}

{tex}\therefore \left| A \right| = \left| {\begin{array}{*{20}{c}} 4&{ - 3} \\ 3&{ - 5} \end{array}} \right| {/tex} = - 20 - (-9) = - 20 + 9 = - 11 {tex} \ne {/tex} 0

Therefore, solution is unique and {tex}X = {A^{ - 1}}B = \frac{1}{{\left| A \right|}}\left( {adj.A} \right)B{/tex}

{tex}\Rightarrow \left[ {\begin{array}{*{20}{c}} x \\ y \end{array}} \right] = \frac{1}{{ - 11}}\left[ {\begin{array}{*{20}{c}} { - 5}&3 \\ { - 3}&4 \end{array}} \right]\left[ {\begin{array}{*{20}{c}} 3 \\ 7 \end{array}} \right]{/tex}

{tex}= \frac{1}{{ - 11}}\left[ {\begin{array}{*{20}{c}} { - 15 + 21} \\ { - 9 + 28} \end{array}} \right] = \frac{1}{{ - 11}}\left[ {\begin{array}{*{20}{c}} 6 \\ 9 \end{array}} \right]{/tex}

{tex}= \left[ {\begin{array}{*{20}{c}} {\frac{{ - 6}}{{11}}} \\ {\frac{{ - 19}}{{11}}} \end{array}} \right]{/tex}

Therefore, {tex}x = \frac{{ - 6}}{{11}}{/tex} and {tex}y = \frac{{ - 19}}{{11}}{/tex}

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Manesh Tandel 6 years, 3 months ago

x=-0.5454 y=-1.727

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Y=1/4log(1-cos2x/1+cos2x) prove that dy/dx=cosec2x

Posted by Pramod Kumar 6 years, 3 months ago

CBSE > Class 12 > Mathematics

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On his birthday rahul decided to donate some money to the children of an orphanage home

Posted by Jayash Saini 6 years, 3 months ago

CBSE > Class 12 > Mathematics

2 answers

Anisha Sharma 6 years, 3 months ago

Question *

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Anisha Sharma 6 years, 3 months ago

So...?? Please correct your wsn

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Every rational function is continuous at every point in its domain. Prove it

Posted by Gautam Gariya 6 years, 3 months ago

CBSE > Class 12 > Mathematics

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X^10+y^3+t^50

Posted by Akshaya Naidu 6 years, 3 months ago

CBSE > Class 12 > Mathematics

0 answers

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Is the determinent of skew symmetric matrix is always zero And can i write it directly in our board exam

Posted by Shivank Bhardwaj 6 years, 3 months ago

CBSE > Class 12 > Mathematics

1 answers

Rishabh Rathi 6 years, 3 months ago

Nope

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Make model paper of mathematics of 2019-2020 soon

Posted by Abhishek Tripathi 6 years, 3 months ago

CBSE > Class 12 > Mathematics

1 answers

Abhi Bhardwaj 6 years, 3 months ago

Ohk

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This time paper was easy or hard yes or no

Posted by Muskan Verma 6 years, 3 months ago

CBSE > Class 12 > Mathematics

1 answers

S.....Sharma☺??? .. 6 years, 3 months ago

Hume phadhna to fir bhi padega paper easy aayega ya hard ye to pata hum nahi laga sakte may be easy ho but mcq or 1 marks question solve karne ka lya hume detail se phadhna hoga

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Approximate (25(^1/3

Posted by Meenakshi Kureel 6 years, 3 months ago

CBSE > Class 12 > Mathematics

2 answers

Meenakshi Kureel 6 years, 3 months ago

Ok thxs

1Thank You

Rishabh Rathi 6 years, 3 months ago

Approximately 2.8

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The number of perfect square below 2007 is

Posted by Jagriti Kumari 6 years, 3 months ago

CBSE > Class 12 > Mathematics

1 answers

Rishabh Rathi 6 years, 3 months ago

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Sir how can we get perfect 100 in maths cbse class 12 boards?

Posted by Ridhi N 6 years, 3 months ago

CBSE > Class 12 > Mathematics

2 answers

Sia ? 6 years, 3 months ago

You can refer to topper's answer sheets.

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S.....Sharma☺??? .. 6 years, 3 months ago

Aap previous year question + ncert =rd sharma=que 100 marks

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Sir please tell me. Is compartment exam is harder than main exam

Posted by Shivangi Dixit 6 years, 3 months ago

CBSE > Class 12 > Mathematics

3 answers

Shivam Yadav 6 years, 3 months ago

No compart is not hard but if you think hard so it hard do ncert and sample papers

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Priya Dharshini 6 years, 3 months ago

Yes some what hard but u can do it surely... dont think exam will be hard and all.... make sure that ur preparations are so hard that u can write all hard exams easily...

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Anisha Sharma 6 years, 3 months ago

Yes compartment exam is harder than main exam.... And there is no sir and ma'am...... All are students here....... So please don't say sir

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Sir compartment tips

Posted by Jalish Choudhary 6 years, 3 months ago

CBSE > Class 12 > Mathematics

2 answers

Priya Dharshini 6 years, 3 months ago

Do ncert questions and previous year question papers..

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Prateek Dwivedi Dwivedi 6 years, 3 months ago

Sir pls tell compartment tips

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20 marks practical include.....????

Posted by Deepak Gautam 6 years, 3 months ago

CBSE > Class 12 > Mathematics

1 answers

Gaurang Bansal 6 years, 3 months ago

Yes

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Two concentric circles of radii a and b ( a>b) are given . Find the length of the cord of the larger circle which touches the smaller circle.

Posted by Roshni Soren 6 years, 3 months ago

CBSE > Class 12 > Mathematics

1 answers

Gaurav Seth 6 years, 3 months ago

Question: Two concentric circles of radii a and b(a>b)are given.Find the length of the chord of the larger circle which touches the smaller circle.

Explanation:

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Exercise 5.4 solution

Posted by Soleman Hoque 6 years, 3 months ago

CBSE > Class 12 > Mathematics

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Find wether the line inter sect or not ? (x-5)/(5t + 2) = (2-y)/5 = (1-z)/-1 , x/1 = (y+ 1/2) /2t = (z-1)/3

Posted by Lucky Kumar Roy 6 years, 3 months ago

CBSE > Class 12 > Mathematics

0 answers

ANSWER

(x²+1)½ + x / x(1+x²)½ + 1+ x² =?

Posted by Aditya Kumar 6 years, 3 months ago

CBSE > Class 12 > Mathematics

0 answers

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cosec inverse x +2 cot inverse 7 +cos inverse 3/4

Posted by Rishabh Yadav 6 years, 3 months ago

CBSE > Class 12 > Mathematics

0 answers

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What is a peturn of Sample paper for 19- 20

Posted by Sandeep Kumawat 6 years, 3 months ago

CBSE > Class 12 > Mathematics

2 answers

S.....Sharma☺??? .. 6 years, 3 months ago

Go to maths and then cbse syllabus

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S.....Sharma☺??? .. 6 years, 3 months ago

Aapko aapka answer ise app par mil jaayega

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Integration of sin x / sin (x+a) dx

Posted by A Sathiyasri 6 years, 3 months ago

CBSE > Class 12 > Mathematics

1 answers

Harsh Vardhan 6 years, 3 months ago

Write sinx in numerator sin(x+a-a) and expand it sin(a-b) take a=x+a and b=a take denominator on both differently

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If someone fail in math in 12 th and he has 6 subject then after giving compt. His result shown compt.

Posted by Satyam Barnwal 6 years, 3 months ago

CBSE > Class 12 > Mathematics

2 answers

Priya Dharshini 6 years, 3 months ago

Only five subjects are there in cbse for class 12th. If maths is ur one of the main subject then they will show the results for sure.

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Charu Vatsal 6 years, 3 months ago

But it shouldn't be done like this, I have heard that if someone has an additional subject then the good marks among additional and another subject are counted in the result

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If det p b c a q c a b r Is zero then find p/(p-a)+q/(q-b)+r/(r-c)

Posted by Kapil Kumar 6 years, 3 months ago

CBSE > Class 12 > Mathematics