dx/4+x²的积分!

问题描述:

dx/4+x²的积分!

∫dx/(4+x²)
=∫[1/(1+x²/4)]d(x/2)
=(1/2)arctan(x/2)+C

求不定积分!∫dx/(4+x²)
∫dx/(4+x²)=(1/2)∫d(x/2)/[1+(x/2)²]=(1/2)arctan(x/2)+C