Question

gn that sin alpha =1/2 and cos bet= 1/2 what is the value of alpha+beta

Answer 1

hope it will clear up your problem

Answer 2

sin(alpha)=1/2
or, sin(alpha)=sin30°
or, alpha=30°
and cos(beta)=1/2=cos60°
or, beta=60°
therfore, alpha+beta=30°+60°=90°