What is the integral of 4xcos(3x) ?

The integral of 4xcos(3x) is 4/9 (3xsin(3x)+cos(3x))+C

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integral of 4xcos(3x)

\int 4 x cos (3 x) d x

\frac{4}{9} (3 x sin (3 x) + cos (3 x)) + C

Solution steps

\int 4 x cos (3 x) d x

Take the constant out:

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

= 4 \cdot \int x cos (3 x) d x

Apply u-substitution

: \int \frac{u cos ( u )}{9} d u

= 4 \cdot \int \frac{u cos ( u )}{9} d u

Take the constant out:

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

= 4 \cdot \frac{1}{9} \cdot \int u cos (u) d u

Apply Integration By Parts

: u sin (u) - \int sin (u) d u

= 4 \cdot \frac{1}{9} (u sin (u) - \int sin (u) d u)

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

= 4 \cdot \frac{1}{9} (u sin (u) - (- cos (u)))

Substitute back

u = 3 x

= 4 \cdot \frac{1}{9} (3 x sin (3 x) - (- cos (3 x)))

Simplify

4 \cdot \frac{1}{9} (3 x sin (3 x) - (- cos (3 x))) : \frac{4}{9} (3 x sin (3 x) + cos (3 x))

= \frac{4}{9} (3 x sin (3 x) + cos (3 x))

Add a constant to the solution

= \frac{4}{9} (3 x sin (3 x) + cos (3 x)) + C

\frac{\partial}{\partial u} (u^{2} + v^{2})

\int \frac{6 ln ( 4 x )}{5} d x

- 2 sin (x)

f (x) = x^{5} - 3 x + 4

\frac{e ^{x}}{x + 1}

What is the integral of 4xcos(3x) ?
The integral of 4xcos(3x) is 4/9 (3xsin(3x)+cos(3x))+C