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Sin2a. Докажите тождество cos 2 a+sin2a *sin2a. (Sin a - cos a )2-1+4sin2a. Sin4a sin2a cos2a cos2a. Sin4a cos4a 1 cos 2 2a /2.
Докажите тождество cos 2 a+sin2a *sin2a. (Sin a - cos a )2-1+4sin2a. Sin4a sin2a cos2a cos2a. Sin4a cos4a 1 cos 2 2a /2.

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