If sin(90° - x) = cos(2x), then what is x?
2025
If sin(90° - x) = cos(2x), then what is x?
- A.
0°
- B.
30°
- C.
25°
- D.
15°
Show answer & explanation
Correct answer: A
sin(90° - x) = cos x. So the equation becomes cos x = cos 2x. Among the given options, x = 0° satisfies it.