化简cos(a-π)cot(5π-a)/sin(-2π-a)
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化简cos(a-π)cot(5π-a)/sin(-2π-a)
化简cos(a-π)cot(5π-a)/sin(-2π-a)
化简cos(a-π)cot(5π-a)/sin(-2π-a)
cos(a-π)cot(5π-a)/sin(-2π-a)
=cos(π-a)cot(4π+π-a)/sin(-2π-a)
=-cosacot(π-a)/sin(-a)
=-cosa(-cota)/(-sina)
=-cosa/sina*cota
=-cota*cota
=-cot²a