Упростите выражения
а)(sin x - cos x)^2/(sin2x-1)
б) 2sin a + (2cos^2 a)/(1+sin a)
а)(sin x - cos x)^2/(sin2x-1)
б) 2sin a + (2cos^2 a)/(1+sin a)
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б)=(2sina+2sin^2(a)+2cos^2(a))\(1+sina) = (2sina+2)\(1+sina) = 2