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

Let {tex}A = [a_{ij}]{/tex} be a skew-symmetric matrix.
Then, {tex}a_{ij} = -a_{ij}{/tex} for all i, j
Now, put i = j, we get
{tex}\Rightarrow{/tex}{tex} a_{ii} = -a_{ii}{/tex} for all values of i
{tex}\Rightarrow{/tex}{tex} 2a_{ii} = 0{/tex}
{tex}\Rightarrow{/tex}{tex} a_{ii} = 0 {/tex} for all values of i
{tex}\therefore{/tex} {tex}a_{11} = a_{22} = a_{33} = ... = a_{nn} = 0{/tex}
{tex}\therefore{/tex} All the diagonal elements of a skew-symmetric matrix are zero.

Hence proved.

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Solve Sin^-1(Sin10)

Posted by Anurag Shakya 6 years, 2 months ago

CBSE > Class 12 > Mathematics

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Chapter 6 exercise 6.1 question no. 6

Posted by Manish Kumar 6 years, 2 months ago

CBSE > Class 12 > Mathematics

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Will objective type queation come from this year??? I heard of 20 marks of objective Is it true?

Posted by Harsh Maurya 6 years, 2 months ago

CBSE > Class 12 > Mathematics

6 answers

Chaudhary Nikhil Panwar 6 years, 2 months ago

Yes

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Priya Dharshini 6 years, 2 months ago

There are objectives in this time paper... it may be mcq,fill ups or one word..

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Navneet . 6 years, 2 months ago

Yes

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Rahul_ Ry(ʘ‿ʘ) 6 years, 2 months ago

20 questions of 1 marks (objective/conceptual)

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Manan Gupta 6 years, 2 months ago

Yes

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Kamal Kumar 6 years, 2 months ago

Yes.

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Cos^2x+3^x second order derivarive

Posted by Vritika Bansal 6 years, 2 months ago

CBSE > Class 12 > Mathematics

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When sample paper for 2020 been upload ??. Becasue this time pater pattern will be change

Posted by Chital Kapadia 6 years, 2 months ago

CBSE > Class 12 > Mathematics

1 answers

Affak Qureshi 6 years, 2 months ago

Ho gaya

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__ __ | -4 1| If A= | 3 1| [_ _] Then determinant of the matrix {A^2016 - 2A^2015 - A^2014} ? 1} 2014 2} 2016 3} -175 4} -25

Posted by Neel Kamal 6 years, 2 months ago

CBSE > Class 12 > Mathematics

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Is that fact is true that Infinite tangents can be drawn in l X l at x=0 , thats why it is not differentiable at x=0 ?

Posted by Neel Kamal 6 years, 2 months ago

CBSE > Class 12 > Mathematics

2 answers

Neel Kamal 6 years, 2 months ago

Thanks but i know that, i just want to know how many tangents can be drawn in mod X at x =0 , ?

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S.... ????☺ 6 years, 2 months ago

The |x| is not differentiable because it's LHD=-1 and RHD=1 and we know that for differentiable LHD=RHD that's why it is not differentiable and we can proof or find this with the help of diagram

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Differentiate: tan-1(cotx)

Posted by Bʌɓʌ Gʋɭsʜʌŋ Kʀ Goswʌɱɩ 6 years, 2 months ago

CBSE > Class 12 > Mathematics

1 answers

Rahul Yadav Yadav 6 years, 2 months ago

DY by DX of tan inverse cot X is equal to 1 upon 1 upon 1 + cot square x in two DY DX of Kotex it is equals to one upon 1 + cot Square X into minus cosec Square x

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Integrate dx/2x-1√x^2+5

Posted by Monu Barala 6 years, 2 months ago

CBSE > Class 12 > Mathematics

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A die is rolled find he probability that an even number is obtained

Posted by Bobby Arora 6 years, 2 months ago

CBSE > Class 12 > Mathematics

2 answers

Priya Pandey 6 years, 2 months ago

3/6

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Nishant Raj 6 years, 2 months ago

1/2

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A die is rolled find the probability that an even number is obtained

Posted by Bobby Arora 6 years, 2 months ago

CBSE > Class 12 > Mathematics

2 answers

Bhumika Bisht 6 years, 2 months ago

3/6 1/2

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Nishant Raj 6 years, 2 months ago

1/2

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y=log(x+√(1+x^2)) prove that dy/dx=1/log(x+√(1+x^2)) *1/√(1+x^2)

Posted by Shivam Singh 6 years, 2 months ago

CBSE > Class 12 > Mathematics

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kya binary operation hat gaya hai chapter1.4 of math

Posted by Abhishek Sharma Sharma 6 years, 2 months ago

CBSE > Class 12 > Mathematics

2 answers

Nishant Raj 6 years, 2 months ago

Yes it's removed

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Suman Sharma 6 years, 2 months ago

Has ur is Sam syllabus me nahi h

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A 10cm tall funnel is being drained with water at a constant rate if 10cc/sec.The mouth of the funnel is 12cm in diameter.How fast is the level dropping when there are 20cc left in the funnel?

Posted by Aastha Saxena 6 years, 2 months ago

CBSE > Class 12 > Mathematics

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If 400\450×100 ??

Posted by Tam Nani 6 years, 2 months ago

CBSE > Class 12 > Mathematics

6 answers

Suman Sharma 6 years, 2 months ago

112.5 is write answer

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Parteek Gurjar 6 years, 2 months ago

88.89

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Pratee Sharma 6 years, 2 months ago

It's 88.89

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Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 2 months ago

Sorry it's 88.89 be correct

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Dill Rajj 6 years, 2 months ago

How it became 100

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Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 2 months ago

100

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Find x and y if :- (3x-9y=8) (4x+7y=-2) By elimination method

Posted by Anesh Khemani 6 years, 2 months ago

CBSE > Class 12 > Mathematics

1 answers

Pratee Sharma 6 years, 2 months ago

x = 38/57 y = -38/57

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25+5

Posted by Utkarsh Garg 6 years, 2 months ago

CBSE > Class 12 > Mathematics

2 answers

Parteek Gurjar 6 years, 2 months ago

It's 30

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Pratee Sharma 6 years, 2 months ago

It's 30

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Integral of tan²xsec²x/1-(tan³)²

Posted by Rahul Sokill 6 years, 2 months ago

CBSE > Class 12 > Mathematics

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√tanx/sinx cosx

Posted by Sidharth Singh 6 years, 2 months ago

CBSE > Class 12 > Mathematics

1 answers

Priya Dharshini 6 years, 2 months ago

It is ncert question 7.2 exercise q.34 divide and multiply by cos^2x.... u will get it in this app..

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In a group of 100 people,60people like to play cricket 20people like to play bath cricket and tennis.how many people like to play tennis but cricket

Posted by Manish Saxena 6 years, 2 months ago

CBSE > Class 12 > Mathematics

2 answers

Rajat Barwar 6 years, 2 months ago

Hey friend please first tell what is the actual ques.( play tennis but cricket??) .. and one more ques.,what is bath cricket..... I was just kidding,don't take it serious in anyway.....

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Harsh Mishra 6 years, 2 months ago

Perhaps, 40 people likes to play just tennis not cricket......Not sure about it just saying logically.....??

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Given a non emty set X,cosider P(X)which is the set of all subset of X Define the relation R in P(X),ARB if and only ifA B an equivanlance relation on P(X)

Posted by Sachin Yaduvanshi 6 years, 2 months ago

CBSE > Class 12 > Mathematics