Question

If Sin A = Cos B then A + B = …………

A) 60° 

B) 90° 

C) 45° 

D) 120°

Answer 1

Correct option is: B) 90°

Sin A = cos B

= sin A = sin (\(90^\circ\)-B) (\(\because\) cos \(\theta\) = sin (\(90^\circ\) - \(\theta\)) 

= A = \(90^\circ\) - B (By comparing angle)

= A + B = \(90^\circ\)

Answer 2

Correct option is: B) 90°