Question

If sin A=cos B then prove that A+B=90

Answer 1

Step-by-step explanation:

sinA=cosB

sinA=sin(90-B)

A=90-B

A+B=90

Answer 2

Answer:

Step-by-step explanation:

sin A=cos B

SinA = Sin(90 - B )  (∵ Cosθ = Sin(90-θ))

A = 90 - B

=> A + B = 90°

Hence proved.