含有三角函数的积分

1. \[\begin{aligned}&\int \sin ax\sin bxdx=-\dfrac{\sin \left( a+b\right) x}{2 \left( a+b\right) }+\dfrac{\sin \left( a-b\right) x}{2 \left( a-b\right) }+C\\ &\int \cos ax\cos bxdx=\dfrac{\sin \left( a+b\right) x}{2 \left( a+b\right) }+\dfrac{\sin \left( a-b\right) x}{2 \left( a-b\right) }+C\\ &\int \sin ax\cos bxdx=-\dfrac{\cos \left( a+b\right) x}{2 \left( a+b\right) }-\dfrac{\cos \left( a-b\right) x}{2 \left( a-b\right) }+C\end{aligned} \]

   • 积化和差

标签：cos,right,bxdx,三角函数,积分,含有,dfrac,sin,left
来源： https://www.cnblogs.com/ctrlplayer/p/13394871.html