Ответ:
Объяснение:
6) cos2a-sin2a*2sin2a*cos2a /sin2a=cos2a(1-2sin^2a/sin2a=cos2a*cos4/sin2a=ctg2a*cos4a
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Ответ:
Объяснение:
6) cos2a-sin2a*2sin2a*cos2a /sin2a=cos2a(1-2sin^2a/sin2a=cos2a*cos4/sin2a=ctg2a*cos4a