f(x)=5sinxcosx-5√3(cosx)^2+5√3/2
=5/2*sin2x-5√3/2*cos2x
=√[(5/2)^2+(5√3/)^2]sin(2x-t)
=5sin(2x-t)
tant=√3,t=派/3
f(x)属于[-5,5]
2x-t属于[k派-派/2,k派+派/2]时递增
x属于[k/2×派-派/12,k/2×派+5派/12]时递增
f(x)=5sinxcosx-5√3(cosx)^2+5√3/2
=5/2*sin2x-5√3/2*cos2x
=√[(5/2)^2+(5√3/)^2]sin(2x-t)
=5sin(2x-t)
tant=√3,t=派/3
f(x)属于[-5,5]
2x-t属于[k派-派/2,k派+派/2]时递增
x属于[k/2×派-派/12,k/2×派+5派/12]时递增