Question

sin3A=cos3A হলে A=?​

Answer 1

1. sin3A = cos3A
2. cos(90°-3A) = cos3A
3. 90° - 3A = 3A
4. 90° = 6A
5. 6A = 90°
6. A = 90°/6
7. A = 15° ans

Hope it will help you!

Answer 2

Answer:

15 degree bro 15 ×3

that's 45