cos(x-TT/6)=m 求cosx+cos(x-TT/3)

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cos(x-TT/6)=m 求cosx+cos(x-TT/3)
cos(x-TT/6)=m 求cosx+cos(x-TT/3)

cos(x-TT/6)=m 求cosx+cos(x-TT/3)