数学题(有关不定积分运算)

问题描述:

数学题(有关不定积分运算)
- ∫dcost)/(2 - cos^2 t)
= - 1/2√2 * ∫[ 1/(√2-cost)+1/(√2+cost) ]d(cost)

1/(2 - cos^2 t)=1/(√2-cost)(√2+cost)=(1/(2√2) *2√2)/(√2-cost)(√2+cost)
=1/(2√2) *((√2-cost)+(√2+cost))/(√2-cost)(√2+cost)
=1/2√2 * [ 1/(√2-cost)+1/(√2+cost) ]
所以有:
- ∫dcost)/(2 - cos^2 t)
= - 1/2√2 * ∫[ 1/(√2-cost)+1/(√2+cost) ]d(cost)