Images 4 COS 2A

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4 cos 2a. 3 - 4cos(a) + cos(2a). Cos4a. Cos4a+cos2a/cos3a. Докажите тождество cos4a+1 1/2sin4a ctga-TGA.
3 - 4cos(a) + cos(2a). Cos4a. Cos4a+cos2a/cos3a. Докажите тождество cos4a+1 1/2sin4a ctga-TGA.

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