Доказать тождество (2sin2a+cos(3π/2-a)-sin(π+a)):(1+sin(3π/2-a) = -2sina​

Question

Доказать тождество (2sin2a+cos(3π/2-a)-sin(π+a)):(1+sin(3π/2-a) = -2sina​

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Answer 1

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