Question

4. @ If sin (A + B) = cos (A - B) = 1, then
(a) A = B = 0 (b) A = B = 45°
(c) A = 60°, B = 30° (d) None of these

Answer 1

Answer:

(B) , A=B=45°

Step-by-step explanation:

I'VE USED BASIC FORMULAES

HOPE IT HELPS ;)

Answer 2

Answer:

b is the correct answer.