What is the integral of xcos(wx) ?

The integral of xcos(wx) is 1/(w^2)(wxsin(wx)+cos(wx))+C

integral of xcos(wx)

\int x cos (w x) d x

\frac{1}{w ^{2}} (w x sin (w x) + cos (w x)) + C

Solution steps

\int x cos (w x) d x

Apply u-substitution

= \int \frac{u cos ( u )}{w ^{2}} d u

Take the constant out:

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

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

Apply Integration By Parts

= \frac{1}{w ^{2}} (u sin (u) - \int sin (u) d u)

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

= \frac{1}{w ^{2}} (u sin (u) - (- cos (u)))

Substitute back

u = w x

= \frac{1}{w ^{2}} (w x sin (w x) - (- cos (w x)))

Simplify

= \frac{1}{w ^{2}} (w x sin (w x) + cos (w x))

Add a constant to the solution

= \frac{1}{w ^{2}} (w x sin (w x) + cos (w x)) + C

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What is the integral of xcos(wx) ?
The integral of xcos(wx) is 1/(w^2)(wxsin(wx)+cos(wx))+C