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Prove that $\tan y=\frac{\sin 2y}{\cos 2y+1}$
in Grade 12 Maths by Wooden (2k points) | 39 views

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RHS, use double angle identities:

$= \dfrac{(2\sin{y}\cos{y})}{(2\cos^2{y} - 1+1)}$

   $= \dfrac{ 2\sin{y}\cos{y}}{2\cos^2{y}}$

$= \dfrac{\sin{y}}{\cos{y}}$

$= \tan{y}$, proven
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