Prove the following identity:
(cosec θ - sin θ)(sec θ - cos θ)(tan θ + cot θ) = 1
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cosec A (1 + cos A)(cosec A - cot A) = 1
sec A (1 - sin A)(sec A + tan A) = 1
(cosec A + sin A)(cosec A - sin A) = cot2 A + cos2 A
(sec A + cos A)(sec A - cos A) = sin2 A + tan2 A