What is the integral of cos(14x) ?

The integral of cos(14x) is 1/14 sin(14x)+C

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integral of cos(14x)

\int cos (14 x) d x

\frac{1}{14} sin (14 x) + C

Solution steps

\int cos (14 x) d x

Apply u-substitution

: \int cos (u) \frac{1}{14} d u

= \int cos (u) \frac{1}{14} d u

Take the constant out:

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

= \frac{1}{14} \cdot \int cos (u) d u

Use the common integral:

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

= \frac{1}{14} sin (u)

Substitute back

u = 14 x

= \frac{1}{14} sin (14 x)

Add a constant to the solution

= \frac{1}{14} sin (14 x) + C

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