\(\frac{\cos \theta}{1-\sin \theta}+\frac{\cos \theta}{1+\sin \theta}=4\) అయితే, 'θ' విలువను కనుగొనండి, ఇక్కడ 'θ' లఘుకోణం.

1
30°
2
45°
3
75°
4
60°

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