Prove that - 1 - sin - - cos -2 - 21 - cos -1 - sin -

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Trigonometric Identities

Prove that : ...

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Prove that : $(1 - sin θ + cos θ)^{2} = 2 (1 + cos θ) (1 - sin θ)$

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{(\frac{1 + \sin θ - \cos θ}{1 + \sin θ + \cos θ})}^{2} = \frac{1 - \cos θ}{1 + \cos θ}

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