Question

plzz help me very urgent​

Answer 1

Answer:

formula used here,

$\cos( \alpha ) + \cos( \beta ) = 2 \cos( \frac{ \alpha + \beta }{2} ) \cos( \frac{ \alpha - \beta }{2} ) \\ \sin( \alpha ) + \sin( \beta ) = 2 \sin( \frac{ \alpha + \beta }{2} ) \cos( \frac{ \alpha - \beta }{2} ) \\ \frac{ \cos( \alpha ) }{ \sin( \alpha ) } = \cot( \alpha )$