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SSC CHSL 2020 · PYQ · Trigonometry · medium

If 3 sec² x − 4 = 0, then the value of x (0 < x < 90°)

Answer

The correct answer is C: 30°. 3sec²x = 4 → sec²x = 4/3 → cos²x = 3/4 → cosx = √3/2 → x = 30°.

  1. A.15°
  2. B.45°
  3. C.30°✓ Correct
  4. D.60°

Explanation

3sec²x = 4 → sec²x = 4/3 → cos²x = 3/4 → cosx = √3/2 → x = 30°.
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