Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

The value of \(\left({ {1 - \cotθ} \over 1 - \tanθ}\right)^2\) - 1 when 0° < θ < 90°, (θ ≠ 0)is equal to:

1
cos2θ- 1
2
sec2 θ + 1
3
cot2​ θ - 1 
4
sin2 θ - 1

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