解
f(x)=√3cosxsinx-cos平方x+1/2
=√3/2(2sinxcosx)-1/2(2cos平方x-1)
=√3/2sin2x-1/2cos2x
=sin2xcosπ/6-cos2xsinπ/6
=sin(2x-π/6)
∴f(π/12)=sin(π/12×2-π/6)=sin(π/6-π/6)=sin0=0
解
f(x)=√3cosxsinx-cos平方x+1/2
=√3/2(2sinxcosx)-1/2(2cos平方x-1)
=√3/2sin2x-1/2cos2x
=sin2xcosπ/6-cos2xsinπ/6
=sin(2x-π/6)
∴f(π/12)=sin(π/12×2-π/6)=sin(π/6-π/6)=sin0=0