Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

\(\rm \left(\frac{\cos A}{1-\sin A}\right)+\rm \left(\frac{\cos A}{1+\sin A}\right)=4\) ,అయిన A విలువ ఎంత అవుతుంది? (0° < A < 90°)

1
90°
2
45°
3
60°
4
30°

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