已知tana=-1/2 则1+2sinacosa/sin^2a-cos^2a=
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已知tana=-1/2 则1+2sinacosa/sin^2a-cos^2a=
已知tana=-1/2 则1+2sinacosa/sin^2a-cos^2a=
已知tana=-1/2 则1+2sinacosa/sin^2a-cos^2a=
参考答案:君子坦荡荡,小人常戚戚.