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