polynomial 多项式

Basically, there are two types of indefinite integral.

One is `polynomial`, which composed by
and

Another is `composite function`, which composed by
and

For the first type of integral, we use basic formula to each part of it directly:

For the second one, oh my god, it's very complicate.

Here's a basic template:

Let's do some exercise:

From these exercises, we know a criticle principle is:
of
is the original function, it can be just a
, it also can be, for example,
.

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