Question

Sin(A+B)=1/2,Cos(A+B )=1/2

Answer 1

Sin(a+b)=cos(a+b)
Sin(a+b)=sin[90-(a+b)]
A+B=90-A-B
2a+2b=90
A+b=45
Putting the value of a+b in sin(a+b) and cos(a+b) then
Sin45=1/2
Cos45=1/2