Question

It Cos 2A = Sin 40 degree then find the measure of angle A​

Answer 1

Step-by-step explanation:

cos2A = sin40°

cos2A = sin(90°–50°)

cos2A = cos50°

2A = 50°

A =25°

Answer 2

Answer:

cos2A = sin40°

sin ( 90°- 2A) = sin (90°- 40°)

90°-90°-40° = 2A

40°/2=A

20° answer