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3dsbulet
@3dsbulet
October 2021
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(sin a-cosa)^2 + sin 2a
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DedushkaBake
Sin2a=2sinacosa, sin²a+cos²a=1 , (a-b)²=a²-2ab+b² ⇒
(sina-cosa)²+sin2a=sin²a-2sina*cosa+cos²a+sin2a
=sin²a+cos²a -2sin2a+sin2a=1-sin2a
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Answers & Comments
(sina-cosa)²+sin2a=sin²a-2sina*cosa+cos²a+sin2a
=sin²a+cos²a -2sin2a+sin2a=1-sin2a