What is the integral of 4x^2sin(7x^3) ?

The integral of 4x^2sin(7x^3) is -4/21 cos(7x^3)+C

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integral of 4x^2sin(7x^3)

\int 4 x^{2} sin (7 x^{3}) d x

- \frac{4}{21} cos (7 x^{3}) + C

Solution steps

\int 4 x^{2} sin (7 x^{3}) d x

Take the constant out:

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

= 4 \cdot \int x^{2} sin (7 x^{3}) d x

Apply u-substitution

: \int \frac{sin ( u )}{21} d u

= 4 \cdot \int \frac{sin ( u )}{21} d u

Take the constant out:

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

= 4 \cdot \frac{1}{21} \cdot \int sin (u) d u

Use the common integral:

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

= 4 \cdot \frac{1}{21} (- cos (u))

Substitute back

u = 7 x^{3}

= 4 \cdot \frac{1}{21} (- cos (7 x^{3}))

Simplify

4 \cdot \frac{1}{21} (- cos (7 x^{3})) : - \frac{4}{21} cos (7 x^{3})

= - \frac{4}{21} cos (7 x^{3})

Add a constant to the solution

= - \frac{4}{21} cos (7 x^{3}) + C

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What is the integral of 4x^2sin(7x^3) ?
The integral of 4x^2sin(7x^3) is -4/21 cos(7x^3)+C