(1)x=π/3代入函数方程：f(x)=-3sin²(π/3)-4cos(π/3)+2=-3(√3/2)²-4(1/2)+2=-9/4-2+2=-9/4(2)f(x)=-3sin²x-4cosx+2=-3(1-cos²x)-4cosx+2=3cos²x-4cosx-1=3(cosx-2/3)²-7/3当cosx=2...