What is the integral of cos(6t) ?

The integral of cos(6t) is 1/6 sin(6t)+C

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integral of cos(6t)

\int cos (6 t) d t

\frac{1}{6} sin (6 t) + C

Solution steps

\int cos (6 t) d t

Apply u-substitution

= \int cos (u) \frac{1}{6} d u

Take the constant out:

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

= \frac{1}{6} \cdot \int cos (u) d u

Use the common integral:

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

= \frac{1}{6} sin (u)

Substitute back

u = 6 t

= \frac{1}{6} sin (6 t)

Add a constant to the solution

= \frac{1}{6} sin (6 t) + C