If \sin \theta=\frac{x^2-y^2}{x^2+y^2}, then which one of the following is correct ?

Correct Answer is : cosθ=2xyx2+y2.

\cos \theta=\frac{2 x y}{x^2-y^2}

\cos \theta=\frac{2 x y}{x^2+y^2}.

\cos \theta=\frac{x-y}{x^2+y^2}

\cos \theta=\frac{x y(x-y)}{x^2+y^2}

UPSC 2013 CDS 1 Math Paper

Question : 44 of 100

Marks: +1, -0

If sin‌θ=‌

x2−y2

x2+y2

, then which one of the following is correct ?

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