sin(3π/2 - x) · ctg(5π/2 + x) =
= - cosx ·(- tgx) = cosx · (sinx/cosx) = sinx
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cosx *sinx/cosx=sinx
sin(3π/2 - x) · ctg(5π/2 + x) =
= - cosx ·(- tgx) = cosx · (sinx/cosx) = sinx