f(x)=cos(2x-π+q)=-cos(2x+q)=sin(3π/2+2x+q)
与y=sin(2x+π/3)重合
所以q+3π/2=2kπ+π/3
q=2kπ-7π/6
q=5π/6.
已知函数f(x)=cos(2x+q)(-π
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