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

Now, {tex}\tan \left( 2 \tan ^ { - 1 } \frac { 1 } { 5 } \right) = \tan \left[ \tan ^ { - 1 } \left( \frac { 2 \times \frac { 1 } { 5 } } { 1 - \left( \frac { 1 } { 5 } \right) ^ { 2 } } \right) \right]{/tex}
{tex}\left[ \because 2 \tan ^ { - 1 } x = \tan ^ { - 1 } \left( \frac { 2 x } { 1 - x ^ { 2 } } \right) ; - 1 < x < 1 \right]{/tex}
{tex}= \tan \left[ \tan ^ { - 1 } \left( \frac { 2 \times 5 } { 24 } \right) \right] = \tan \left[ \tan ^ { - 1 } \left( \frac { 5 } { 12 } \right) \right] = \frac { 5 } { 12 }{/tex}
{tex}\left[ \because \tan \left( \tan ^ { - 1 } x \right) = x ; \forall x \in R \right]{/tex}

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There are 81 students in a class and 4/9 of the students are girls. How many boys are there in the class ?

Posted by Karan G 6 years, 3 months ago

CBSE > Class 12 > Mathematics

4 answers

Nikhil Agarwal 6 years, 3 months ago

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Madhu Jangra 6 years, 3 months ago

Total students = 81 girls =4/9 ×81 = 36 boys = total- girls = 81-36 = 45 boys

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Muskan Khan 6 years, 3 months ago

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Naveen Kumar Sharma 6 years, 3 months ago

45 boys

2Thank You

ANSWER

Is moderation is in mathematics cbse this year

Posted by Aniket Sharma 6 years, 3 months ago

CBSE > Class 12 > Mathematics

0 answers

ANSWER

Find dy/dx of log 1+x-2x/2+x

Posted by Subham Tiwary 6 years, 3 months ago

CBSE > Class 12 > Mathematics

1 answers

Nikhil Agarwal 6 years, 3 months ago

Log (-2x-1)

1Thank You

ANSWER

For boards which book is best

Posted by Asha Mehta 6 years, 3 months ago

CBSE > Class 12 > Mathematics

6 answers

Yasir Khan 6 years, 3 months ago

Solve ncert and then go for at least 5-6 last year papers ....this will most probably get u 100% in maths if u do it the right way.. Hope this helps! ?? All the best!

0Thank You

Preeti Bartwal 6 years, 3 months ago

Ncert best book

0Thank You

???. Pragati 6 years, 3 months ago

Ncert

0Thank You

Rudra Singh 6 years, 3 months ago

RS Aggrwal is the best book

0Thank You

Aniket Sharma 6 years, 3 months ago

Xam idea maths

2Thank You

Nishu Sahu 6 years, 3 months ago

Ncert

3Thank You

ANSWER

Prove that F(x)=|x-1|, x€R is not differentiable at x=1

Posted by Humourous Mehafil Gupta 6 years, 3 months ago

CBSE > Class 12 > Mathematics

0 answers

ANSWER

Show that f(x)={ sin3x/tan2x x<0 3/2 x=0 Log(1+3x)/e^2x -1 x >0

Posted by Rohitas Meena 6 years, 3 months ago

CBSE > Class 12 > Mathematics

2 answers

Shubham Singhal 6 years, 3 months ago

https://drive.google.com/file/d/1wp8h__ibM6y17SAKlP0lQK844oM7X9cw/view?usp=sharing

0Thank You

Rohitas Meena 6 years, 3 months ago

Is countinous at x=0

0Thank You

ANSWER

Integration of (1+cosx) /sinx

Posted by Suraj Krishna Tripathi 6 years, 3 months ago

CBSE > Class 12 > Mathematics

1 answers

Rohitas Meena 6 years, 3 months ago

{-sinx*sinx}-cosx*(1+cosx)}\sin^2x

0Thank You

ANSWER

How to do the exercise of determinent using properties

Posted by Anjali Goyat 6 years, 3 months ago

CBSE > Class 12 > Mathematics

1 answers

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

First learn or clear all the properties then for solving question first see the ans. Of queation and then try to do yourself maximum 5 qustion solve like that now concept of property slightly clear in your mind now u try to solve question yourself

1Thank You

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1/4√4x^3-1 +cos^2 (5x + 8) differentiate

Posted by Mihir Kumar 6 years, 3 months ago

CBSE > Class 12 > Mathematics

1 answers

Rohitas Meena 6 years, 3 months ago

(12x^2-1/8√4x^3-1 )-5sin^2(5x+8)

0Thank You

ANSWER

Sample paper of 12 2019

Posted by Sarita Raj 6 years, 3 months ago

CBSE > Class 12 > Mathematics

2 answers

Sarita Raj 6 years, 3 months ago

Thnq

0Thank You

Manmeet Kaur 6 years, 3 months ago

It is not available right now. Sample papers will be alloted to class 12 after december

1Thank You

ANSWER

X\(x+1)*(x+2)

Posted by Nitish Kumar 6 years, 3 months ago

CBSE > Class 12 > Mathematics

0 answers

ANSWER

If tanA =a/b, find the secA

Posted by Amaresh Khened 6 years, 3 months ago

CBSE > Class 12 > Mathematics

5 answers

Amaresh Khened 6 years, 3 months ago

I cannot understand ,nihal ojha answer it by giving space

0Thank You

Nikhil Agarwal 6 years, 3 months ago

a/bsina

0Thank You

Nihal Ojha 6 years, 3 months ago

sinA/cosA = a/b Squaring both sides sin²A/cos²A = a²/b² adding 1 to both sides sin²A+cos²A/cos²A = a²+b²/b² 1/cos²A = a²+b²/b² sec²A = a²+b²/b² secA = (underoot a²+b²) /b

2Thank You

Ashish Singh 6 years, 3 months ago

Bcosx

2Thank You

Akhileshwar Singh 6 years, 3 months ago

SecA=b/underroot a^2+b^2.

1Thank You

ANSWER

Find the values of a&b if (4a-2,b+4)=(2a,4)

Posted by Paras Tiwari 6 years, 3 months ago

CBSE > Class 12 > Mathematics

1 answers

Ritu R 6 years, 3 months ago

a = 1 and b= 0

4Thank You

ANSWER

Sir i need a new latest sample paper of mathematics class 12th for 2019 20 examinnation!!!

Posted by Keshav Modi 6 years, 3 months ago

CBSE > Class 12 > Mathematics

1 answers

Akhileshwar Singh 6 years, 3 months ago

Me too bro

0Thank You

ANSWER

Evaluate tan(1/2sin inverse 3/5)

Posted by Vipin Tyagi 6 years, 3 months ago

CBSE > Class 12 > Mathematics

0 answers

ANSWER

Derivate cos invers

Posted by Rajan Bajaj 6 years, 3 months ago

CBSE > Class 12 > Mathematics

1 answers

Ajay Rajput 6 years, 3 months ago

-1/√1-x^2

1Thank You

ANSWER

What is the formula to find the value of sin38=

Posted by Aniket Yadav 6 years, 3 months ago

CBSE > Class 12 > Mathematics

0 answers

ANSWER

graph of cos(x-pi/2) along with their x and y values

Posted by Vivek Kharayat 6 years, 3 months ago

CBSE > Class 12 > Mathematics

1 answers

Rishabh Rathi 6 years, 3 months ago

It will be the graph of sinx. Cos(x-pi/2)=cos(pi/2-x) since inside cos negative gets diluted.

0Thank You

ANSWER

A particle moves along the curve Y is equals to X square + 2 X at what point as on the curve are the X and Y coordinates of the particle changing at the same rate

Posted by Poonam Mishra 6 years, 3 months ago

CBSE > Class 12 > Mathematics

1 answers

Rishabh Rathi 6 years, 3 months ago

At x=-3/2 or -1/2

0Thank You

ANSWER

shaded the region for inequality y ≥ 2x

Posted by Devanshu Kumar 6 years, 3 months ago

CBSE > Class 12 > Mathematics

1 answers

Rishabh Rathi 6 years, 3 months ago

Draw line. Y=2X and shade the region above it since y is greater than 2x.

3Thank You

ANSWER

Reference book for mathematics

Posted by Naveen Kumar Sharma 6 years, 3 months ago

CBSE > Class 12 > Mathematics

6 answers

Harshit Raj 6 years, 3 months ago

Problems in mathematics by Dorofeev

0Thank You

Priya Dharshini 6 years, 3 months ago

U can use rs agarwal,rd sharma for boards and cengage for jee

0Thank You

Aditya Dwivedi 6 years, 3 months ago

https://amzn.to/2X8rNzQ use this to buy on amazon

0Thank You

Aditya Dwivedi 6 years, 3 months ago

use cengage good reference book for jee as well as board

0Thank You

Rishabh Rathi 6 years, 3 months ago

R. D and ncert should be enough for boards.

1Thank You

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

I think RD sharma is best

1Thank You

ANSWER

A man 160 cm tall walks away from a source of light situated at the top of a pole 6 m high at the rate of 1.1 m/sec how fast os the lenght of his shadow increasing when he is 1 m away from the pole

Posted by Abhishek Jaiswal 6 years, 3 months ago

CBSE > Class 12 > Mathematics

2 answers

Rishabh Rathi 6 years, 3 months ago

Its 0.4m/s

0Thank You

Rishabh Rathi 6 years, 3 months ago

0.4 Write constraint equation which will give dy/dt=(h/H-h) dx/dt. Here dy/dt will give speed of shadow and dx/dt is speed of man, h is height of man and H is height of lamp.

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