Question

sin(theata)cos(90degree-theata)+cos(theata)sin(90degree-theata)=???

Answer 1

Answer:

sin^2theta+cos^2theta=1 very simple

Answer 2

Answer:

$\sin( \alpha ) \cos(90 - \alpha ) + \cos( \alpha ) \sin(90 - \alpha ) = \sin( \alpha + (90 - \alpha )) = \sin(90) = 1$