Question

If a and b are two complementary angles find sin a. Cos b + cos a. Sin b
Answer fastttt plsss

Answer 1

as the angles are complementary this we can write the equation as :

sin a . cos (90-a) + cos a . sin (90-a)

= sin a . sin a + cos a . cos a

= sin^2 a + cos ^2 a

= 1