Question

prove cotQ- tanQ = 2cos2 Q-1/SinQcosQ​

Answer 1

see the attachment hope it will help you

vasim@27

Tora17 flw her♥️

Answer 2

$\cot( \alpha ) - \tan( \alpha ) \\ \frac{ \cos( \alpha ) }{ \sin( \alpha ) } - \frac{ \sin( \alpha ) }{ \cos( \alpha ) } \\ \frac{ { \cos( \alpha ) }^{2} - { \sin( \alpha ) }^{2} }{ \cos( \alpha ) \sin( \alpha ) } \\ \frac{ \cos(2 \alpha ) }{ \cos( \alpha ) \sin( \alpha ) } \\ lhs = rhs \\ proved$