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Prove that: (1+sinA-cosA)/(1+sinA+cosA...

Prove that:
`(1+sinA-cosA)/(1+sinA+cosA)=tanA/2`

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To prove that \[ \frac{1 + \sin A - \cos A}{1 + \sin A + \cos A} = \tan \frac{A}{2}, \] we will manipulate the left-hand side (LHS) step by step. ...
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