Question

If tan A = 1, sin B = 1√2, find the value of cos (A + B)

Answer 1

Answer:

Step-by-step explanation:

TanA = 1

=> A = Tan⁻¹ (1) = 45°

SinB = 1/√2

=> B = Sin⁻¹(1/√2) = 45°

Thus Cos(A+B) = Cos(45 + 45) = Cos90° = 0.