fx=根号3 cos(3x-θ)-sin(3x-θ)这个要怎么化简?
问题描述：
fx=根号3 cos(3x-θ)-sin(3x-θ)这个要怎么化简?
RT
答
f(x)=√3cos(3x-θ)-sin(3x-θ)
=2[(√3/2)*cos(3x-θ)-(1/2)*sin(3x-θ)]
=2[cos(π/6)*cos(3x-θ)-sin(π/6)*sin(3x-θ)]
=2cos(π/6+3x-θ)
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