Ответ:
= (2sin2a-cos2a-sin2a)/ (2sin2a.cos2a+sin2a) = sin2a (2cos2a-1)/ sin2a (2cos2a+1) = (2cos2a-1)/ (2cos2a+1)
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Ответ:
= (2sin2a-cos2a-sin2a)/ (2sin2a.cos2a+sin2a) = sin2a (2cos2a-1)/ sin2a (2cos2a+1) = (2cos2a-1)/ (2cos2a+1)