Show that -1-sin A1-sin A-cos A1-sin A

L.H.S =√( 1 sin A #160; 1+sin A #160; #160; ) =√(( 1+sin A #160; ) ( 1 sin A #160; ) #160; ( 1+sin A #160; ) ( 1+sin A #160; ) #16 ...

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Cos(A+B)Cos(A-B)

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Question

Show that
$\sqrt{\frac{1 - sin A}{1 + sin A}} = \frac{cos A}{1 + sin A}$

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