tan(-a-2π)化简 cos3次(-a-π)化简
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tan(-a-2π)化简cos3次(-a-π)化简tan(-a-2π)化简cos3次(-a-π)化简tan(-a-2π)化简cos3次(-a-π)化简tan(-a-2π)=tan(-a)=-tanac
tan(-a-2π)化简 cos3次(-a-π)化简
tan(-a-2π)化简 cos3次(-a-π)化简
tan(-a-2π)化简 cos3次(-a-π)化简
tan(-a-2π)=tan(-a)=-tana
cos3次(-a-π)=-(cosa)^3