Объяснение:
3 sina cosa cos2a = 3/2 × 2sinacosa × cos2a = 3/2 × sin2acos2a = 3/2 × 2/2 sin2a cos2a = 3/4 sin 4a
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Объяснение:
3 sina cosa cos2a = 3/2 × 2sinacosa × cos2a = 3/2 × sin2acos2a = 3/2 × 2/2 sin2a cos2a = 3/4 sin 4a