What is the integral of 3cos(2x) ?

The integral of 3cos(2x) is 3/2 sin(2x)+C

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integral of 3cos(2x)

\int 3 cos (2 x) d x

\frac{3}{2} sin (2 x) + C

Solution steps

\int 3 cos (2 x) d x

Take the constant out:

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

= 3 \cdot \int cos (2 x) d x

Apply u-substitution

= 3 \cdot \int cos (u) \frac{1}{2} d u

Take the constant out:

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

= 3 \cdot \frac{1}{2} \cdot \int cos (u) d u

Use the common integral:

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

= 3 \cdot \frac{1}{2} sin (u)

Substitute back

u = 2 x

= 3 \cdot \frac{1}{2} sin (2 x)

Simplify

3 \cdot \frac{1}{2} sin (2 x) : \frac{3}{2} sin (2 x)

= \frac{3}{2} sin (2 x)

Add a constant to the solution

= \frac{3}{2} sin (2 x) + C