Ответ:
(sin2a+3cos2a)^2+(cos2a-3sin2a)^2 = sin(2a)²+9cos(2a)²+cos(2a)²+9sin(2a)² = 1+9 = 10
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Ответ:
(sin2a+3cos2a)^2+(cos2a-3sin2a)^2 = sin(2a)²+9cos(2a)²+cos(2a)²+9sin(2a)² = 1+9 = 10