Question

Find A, if sin3A = cos (A – 10), 3A being an acute angle.​

Answer 1

Answer:

Sin 3A = cos 90 - 3a

Cos 90 - 3a = cos a - 10

90 - 3a = a - 10

90 - 10 = 3a + a

80 = 4a

A = 80 / 4

A = 20

Ans the value of acute angle is 20 degrees.