cot765°-tan675°+cot(-690°)-tan(-300°)等于什么?
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![cot765°-tan675°+cot(-690°)-tan(-300°)等于什么?](/uploads/image/z/3010051-19-1.jpg?t=cot765%C2%B0-tan675%C2%B0%2Bcot%EF%BC%88-690%C2%B0%EF%BC%89-tan%EF%BC%88-300%C2%B0%EF%BC%89%E7%AD%89%E4%BA%8E%E4%BB%80%E4%B9%88%3F)
cot765°-tan675°+cot(-690°)-tan(-300°)等于什么?
cot765°-tan675°+cot(-690°)-tan(-300°)等于什么?
cot765°-tan675°+cot(-690°)-tan(-300°)等于什么?
2!
cot765°-tan675°+cot(-690°)-tan(-300°)
=cot(720+45)-tan(720-45)+cot(-720+30)-tan(-360+60)
=cot45+tan45+cot30-tan60
=1+1+根号3-根号3
=2