Question

If cos 2A=sin (A-15),find A.

Answer 1

cos 2A=sin(A-15)

sin(90°-2A)=sin(A-15)

90-2A=A- 15

2A + A=90+15

3A=105

A=105/3

A= 35

Hope it helps

Answer 2

Here is your answer.....