cos(√3+φ)是不是写错了是cos(√3x+φ)若是的话f（x）=2(1/2cos(√3x+φ)-√3/2sin(√3x+φ))=2(sin30cos(√3x+φ)-cos30sin(√3x+φ))=2sin(30-√3x-φ)余弦为偶函数只要30-φ=kπ+π/2 k=z整数 就行,例如φ=-60即...