Question #cf8dc

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Apr 4, 2017

#(sin x + cos x)^2 = sin^2 x + cos^2 x + 2sin x.cos x #
Since,
#sin^2 x + cos^2 x = 1#
#2sin x.cos x = sin 2x#,
Therefore,
#(sin x + cos x)^2 = 1 + sin 2x#

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Question #cf8dc

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