What is the integral of sin(9pix) ?

The integral of sin(9pix) is -1/(9pi)cos(9pix)+C

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integral of sin(9pix)

\int sin (9 π x) d x

- \frac{1}{9 π} cos (9 π x) + C

Solution steps

\int sin (9 π x) d x

Apply u-substitution

= \int sin (u) \frac{1}{9 π} d u

Take the constant out:

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

= \frac{1}{9 π} \cdot \int sin (u) d u

Use the common integral:

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

= \frac{1}{9 π} (- cos (u))

Substitute back

u = 9 π x

= \frac{1}{9 π} (- cos (9 π x))

Simplify

= - \frac{1}{9 π} cos (9 π x)

Add a constant to the solution

= - \frac{1}{9 π} cos (9 π x) + C

What is the integral of sin(9pix) ?
The integral of sin(9pix) is -1/(9pi)cos(9pix)+C