Question

Can someone please answer question 10...urgent....thank you

Answer 1

Step-by-step explanation:

$\cos( \alpha ) \cos( \beta ) - \sin( \alpha ) \sin( \beta ) = \cos( \alpha + \beta )$

$\cos( \alpha) \sin( \beta ) + \sin( \alpha) \cos( \beta ) = \sin( \alpha + \beta )$