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True if and only if(iitjee mains question)

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+2 votes
54 views
asked Jun 19, 2017 in Mathematics by ankitdixit (1,339 points) ● 12 ● 50

1 Answer

+1 vote
answered Jun 19, 2017 by Abhishek Kumar (14,593 points) ● 5 ● 9 ● 35
 
Best answer

sin2a = 4xy/(x + y)2 is true if and only if x=y and x not equal to 0

Proof:

commented Jun 19, 2017 by ankitdixit (1,339 points) ● 12 ● 50
but answer is not correct  and the step seven from down is also wrong
commented Jun 20, 2017 by Abhishek Kumar (14,593 points) ● 5 ● 9 ● 35
go through the solution carefully
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