f(x)=4sin(x-派/6)cosx+1

问题描述:

f(x)=4sin(x-派/6)cosx+1
怎么求单调区间?

f(x)=4sin(x-π/6)cosx+1=4[sinxcos(π/6)-cosxsin(π/6)]cosx+1=4[(√3/2)sinx -(1/2)cosx]cosx +1=2√3sinxcosx -2cos²x +1=√3(2sinxcosx)-(2cos²x-1)=√3sin(2x)-cos(2x)=2[(√3/2)sin(2x)-(1/2)cos(2...