What is the integral of pisin(pix) ?

The integral of pisin(pix) is -cos(pix)+C

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integral of pisin(pix)

\int π sin (π x) d x

- cos (π x) + C

Solution steps

\int π sin (π x) d x

Take the constant out:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= π \cdot \int sin (π x) d x

Apply u-substitution

: \int sin (u) \frac{1}{π} d u

= π \cdot \int sin (u) \frac{1}{π} d u

Take the constant out:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= π \frac{1}{π} \cdot \int sin (u) d u

Use the common integral:

\int sin (u) d u = - cos (u)

= π \frac{1}{π} (- cos (u))

Substitute back

u = π x

= π \frac{1}{π} (- cos (π x))

Simplify

π \frac{1}{π} (- cos (π x)) : - cos (π x)

= - cos (π x)

Add a constant to the solution

= - cos (π x) + C

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