Question

2siny-sin2y/2siny+sin2y

Answer 1

$\frac{2 \sin(y) - 2 \sin(y) \ \cos(y) }{2 \sin(y) + 2 \sin(y) \cos(y) }$
$\frac{2 \sin(y) \times (1 - \cos(y) )}{2 \sin(y) \times (1 + \cos(y) )}$
$\frac{1 - \cos(y) }{1 + \cos(y) }$

$\tan(( \frac{y}{2} ) {}^{2} )$
ответ