Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

\(\rm \sqrt{\frac{1-\cos \theta}{1+\cos \theta}} \times \sqrt{\frac{cosec \ \theta- \cot \theta}{cosec \ \theta+ \cot \theta}} =\frac{1-r}{1+r} \) , అప్పుడు r విలువ?

1
sin θ
2
cosec θ
3
sec θ
4
cos θ  

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