other govt exam DRDO CEPTAM Admin & Allied (A&A) 2022 Mock Test Quantitative Aptitude Trigonometry

If (2 cos A + 1) (2 cos A - 1) = 0, 0° < A ≤ 90°, then find the value of A.

1
60°
2
45°
3
90°
4
30°
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