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25 Oct 18

If [1+cosA / 1-cosA]^1/2 = x/y.Then value of tan A=??🤔

Replies to this post

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Adithya

2xy(x^2-y^2) .,..... Think so

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Ã
ÃbHÏ

Aaditya Kiran K Sujith.,where did u find the JEE monthly contest.??

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A
Aaditya

1+cos(A)=2cos^2(A/2) 1-cos(A)=2sin^2(A/2) Putting these in above qstn. We get, {Cos^2(A/2)}/{Sin^2(A/2)}^1/2 =cotA/2=x/y => tan A/2=y/x also tan A= (2tan A/2) / (1-tan^2A/2) Finally we get ans.= 2xy/(x^2-y^2)

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