化简求值 sin(x+3分之派)+2sin(x-3分之派)-根3cos(3分之2派 -x)

问题描述:

化简求值 sin(x+3分之派)+2sin(x-3分之派)-根3cos(3分之2派 -x)

sin(x+π/3)+2sin(x-π/3)-√3 cos(2π/3-x) =sin(x+π/3)+2sin(x-π/3)+√3 cos(x+π/3) =[sin(x+π/3)+√3 cos(x+π/3)]+2sin(x-π/3) =2sin(x+2π/3)+2sin(x-π/3) =2sin(π/3-x)+2sin(x-π/3) =0...