高数咸鱼在此谢过quq
(8)=(1/2)/√(x²-6).d(x²-6)=√(x²-6)十C
(12)换元,t=√x,x=t²
(16)设t=e^x
(18)(arctanx)'=1/(1十x²)设t=arctanx
(24)积化和差
害怕,学渣是不太懂的