(1)函数的最小正周期T
(2)函数f(x)的值域
(1)函数的最小正周期T
(2)函数f(x)的值域
f(x)=-3sin(x+5π)cos(x+7π).=-3sin(x+π)cos(x+π)=-3/2sin(2x+2π)=-3/2sin2x
最小正周期是π,值域是[-3/2,3/2]
f﹙x﹚=﹣3sinxcos=﹣3/2sin2x T=2π/2=π
zhiyu为﹣3/2dao3/2
f(x)=-3*(-sinx)*(-cosx)=-3sinx*cosx=-3/2*sin2x
(1)T=2π/2=π
(2)|sin2x|<=1,所以-3/2<=f(x)<=3/2