What is the integral of 7xcos(x^2) ?

The integral of 7xcos(x^2) is 7/2 sin(x^2)+C

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integral of 7xcos(x^2)

\int 7 x cos (x^{2}) d x

\frac{7}{2} sin (x^{2}) + C

Solution steps

\int 7 x cos (x^{2}) d x

Take the constant out:

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

= 7 \cdot \int x cos (x^{2}) d x

Apply u-substitution

= 7 \cdot \int \frac{cos ( u )}{2} d u

Take the constant out:

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

= 7 \cdot \frac{1}{2} \cdot \int cos (u) d u

Use the common integral:

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

= 7 \cdot \frac{1}{2} sin (u)

Substitute back

u = x^{2}

= 7 \cdot \frac{1}{2} sin (x^{2})

Simplify

7 \cdot \frac{1}{2} sin (x^{2}) : \frac{7}{2} sin (x^{2})

= \frac{7}{2} sin (x^{2})

Add a constant to the solution

= \frac{7}{2} sin (x^{2}) + C

What is the integral of 7xcos(x^2) ?
The integral of 7xcos(x^2) is 7/2 sin(x^2)+C