a向量=(cosx,sinx),b向量(cosx,√3cosx),f(x)=a向量×b向量,求函数f(x)的最小正周期
f(x)=cos^2 x+√3sinxcosx
=1/2(cos2x+1)+√3/2 sin2x
=cos2x *1/2 +√3/2 sin2x +1/2
=cos2xcos派/3+sin2xsin派/3+1/2
=cos(2x-派/3)+1/2
T最小=2派/2 =派
a向量=(cosx,sinx),b向量(cosx,√3cosx),f(x)=a向量×b向量,求函数f(x)的最小正周期
f(x)=cos^2 x+√3sinxcosx
=1/2(cos2x+1)+√3/2 sin2x
=cos2x *1/2 +√3/2 sin2x +1/2
=cos2xcos派/3+sin2xsin派/3+1/2
=cos(2x-派/3)+1/2
T最小=2派/2 =派