prove that
(1+sin+cos)^2=2(1+Sin)(1+cos)
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(1+sin+cos)^2=1+sin^2+cos^2+2sincos+2sin+2cos
=1+1+2sincos+2sin+2cos
=2(1+sincos+sin+cos)
=2(1+cos+(1+cos)sin)
=2(1+cos)(1+sin)
=1+1+2sincos+2sin+2cos
=2(1+sincos+sin+cos)
=2(1+cos+(1+cos)sin)
=2(1+cos)(1+sin)
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