Sin A upon 1+cos A = 1-cosA upon sinA
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Step-by-step explanation:
sin A
--------
1+ cos A
sin squareA
=------------------
(1+cosA) square
1-cos squareA
=--------------------
(1+cosA) square
(1-cosA)(1+cosA)
=----------------------
(1+cosA) square
(1-cosA)
=-----------
(1+cosA)
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Have a look to this attachment
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