化简:sin(a-π)cot(a-2π)/cos(a-π)tan(a-2π)

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化简:sin(a-π)cot(a-2π)/cos(a-π)tan(a-2π)
x){3

化简:sin(a-π)cot(a-2π)/cos(a-π)tan(a-2π)
化简:sin(a-π)cot(a-2π)/cos(a-π)tan(a-2π)

化简:sin(a-π)cot(a-2π)/cos(a-π)tan(a-2π)
=-sina*cota/-cosa*tana
=-sina*cota/-sina
=cota