Teaching OSSTET Mock Test 2023 Quantitative Aptitude Trigonometry

\(\rm\frac{\sin x}{1+\cos x}+\frac{\sin x}{1-\cos x}=4\) এবং 0° ≤ x < 90° হলে x-এর মান কত?

1
10° 
2
15°
3
30°
4
45°
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