Question

solve this:
the answer =
$2 \cosec( \alpha )$
​

Answer 1

$\sqrt{ \frac{1 + \cos( \alpha ) }{1 - \cos( \alpha ) } } + \sqrt{ \frac{1 - \cos( \alpha ) }{1 + \cos( \alpha ) } } \\ \frac{ \sqrt{1 + \cos( \alpha ) } }{ \sqrt{1 - \cos( \alpha ) } } + \frac{ \sqrt{1 - \cos( \alpha ) } }{1 + \cos( \alpha ) } \\ \frac{1 - \cos {}^{2} (a) }{1 - \cos {}^{2} ( \alpha ) } = 1$

ok