(1-sinA+cosA)^2 = 2(1+cosA)(1-sinA ).
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(1-sin o)^2 + con^2o -2(1-sino +cos o)
1+sin^2 o - 2sin o + cos^2 o +2coso - 2sinocoso
1+1 -2sino +2coso -2sinocoso
2(1+coso)(1-sino)
Proved
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