Question #968f0

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Question #968f0

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Answer 1 · 2017-06-25T04:11:56

$\frac{\frac{sin x}{cos x} (\frac{sin y}{cos y})}{(\frac{sin x}{cos x} + \frac{sin y}{cos y})} =$ $(sin x/(cos x)(sin y/(cos y)))/((sin x/(cos x) + sin y/(cos y))] =$
$= (\frac{sin x . sin y}{sin x . cos y + sin y . cos x}) = \frac{sin x . sin y}{sin (x + y)}$ $= ((sin x.sin y)/(sin x.cos y + sin y.cos x)) = (sin x.sin y)/(sin (x + y)$

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