化简 (sin^2(a+π)cos(2π-a)cot(a-2π))/(tan(π-a)cos^3(-a-π))

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化简(sin^2(a+π)cos(2π-a)cot(a-2π))/(tan(π-a)cos^3(-a-π))化简(sin^2(a+π)cos(2π-a)cot(a-2π))/(tan(π-a)cos^

化简 (sin^2(a+π)cos(2π-a)cot(a-2π))/(tan(π-a)cos^3(-a-π))
化简 (sin^2(a+π)cos(2π-a)cot(a-2π))/(tan(π-a)cos^3(-a-π))

化简 (sin^2(a+π)cos(2π-a)cot(a-2π))/(tan(π-a)cos^3(-a-π))
(sin^2(a+π)cos(2π-a)cot(a-2π))/(tan(π-a)cos^3(-a-π))
=(sin^2(a)cosa*cosa/sina)/(-sina/cosa*cos^3(a))
=(sina*cos^2(a))/(-sina*cos^2(a))
=-1