ПОДРОБНОЕ решение
(sin^(4)a+cos^(4)a-1)/(sin^(6)a+cos^(6)a-1)
√((1+sina)/(1-sina))-√((1-sina)/(1+sina))
(cos^(3)a-sin^(3)a)/(1+sina*cosa)
(1-sin^(4)a-cos^(4)a)/(cos^(4)a)
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