Indefinite integration 不定积分

Anti-derivative 导数反向

Antiderivative is the reverse relation of derivative.

For example, we know that the derivative of
is
. This means that an antiderivative of
is
.

Solving indefinite integral formula is kind of like do anti-derivative.

The indefinite integral of
is expressed as

In general,

or

means infinite
.

Here
actually is the original function
.

If we want to make it infinite, we should add or minus a number to it, we call that number `C`. Finally we got

One thing you should know is that
means so many many
which composed with
adding or subtracting a unknown random number

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