Question

cos2 α ∙ tg2 α : ( 1- cos2 α )
упростить

Answer 1

Ответ:

$\cos(2 \alpha ) \times \frac{ \sin(2 \alpha ) }{ \cos(2 \alpha ) } \div (1 - \cos(2 \alpha ) ) = \ \sin(2 \alpha ) \div 2 \sin {}^{2} ( \alpha ) = \frac{2 \sin( \alpha ) \cos( \alpha ) }{2 { \sin( \alpha ) }^{2} } = \frac{ \cos( \alpha ) }{ \sin( \alpha ) } = \cot( \alpha )$