1-t^2分之t^2的不定积分怎么算
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1-t^2分之t^2的不定积分怎么算
![1-t^2分之t^2的不定积分怎么算](/uploads/image/z/17789086-46-6.jpg?t=1-t%5E2%E5%88%86%E4%B9%8Bt%5E2%E7%9A%84%E4%B8%8D%E5%AE%9A%E7%A7%AF%E5%88%86%E6%80%8E%E4%B9%88%E7%AE%97)
∫ t^2/(1-t^2) dt
= -∫ dt + ∫ dt/(1-t^2)
= - t +∫ dt/(1-t^2)
let
t = siny
dt = cosy dy
∫ dt/(1-t^2)
=∫ secy dy
=ln|secy + tany |
=ln| (1+t)/√(1-t^2) |
=(1/2)ln|(1+t)/(1-t)|
∫ t^2/(1-t^2) dt
= - t +∫ dt/(1-t^2)
=-t +(1/2)ln|(1+t)/(1-t)| + C
= -∫ dt + ∫ dt/(1-t^2)
= - t +∫ dt/(1-t^2)
let
t = siny
dt = cosy dy
∫ dt/(1-t^2)
=∫ secy dy
=ln|secy + tany |
=ln| (1+t)/√(1-t^2) |
=(1/2)ln|(1+t)/(1-t)|
∫ t^2/(1-t^2) dt
= - t +∫ dt/(1-t^2)
=-t +(1/2)ln|(1+t)/(1-t)| + C