Question

( alpha+beta=90 )
( sin ^{2}left(90^{circ}-alpharight)+sin ^{2}left(90^{circ}-3right) )
( =cos ^{2} alpha+cos ^{2} beta )
( =frac{cos ^{2} alpha+sin ^{2} alpha}{1}=0 )

# 11. If a and B are complementary angles then sin? (90°- a)+sin? (90°-B) (a) o (b) 1 (c)-1 (d) 2

Solution