What is the integral of xtanh(x^2+1) ?

The integral of xtanh(x^2+1) is 1/2 ln|cosh(x^2+1)|+C

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integral of xtanh(x^2+1)

\int x tanh (x^{2} + 1) d x

\frac{1}{2} ln cosh (x^{2} + 1) + C

Solution steps

\int x tanh (x^{2} + 1) d x

Apply u-substitution

= \int \frac{tanh ( u )}{2} d u

Take the constant out:

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

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

Rewrite using trig identities

= \frac{1}{2} \cdot \int \frac{sinh ( u )}{cosh ( u )} d u

Apply u-substitution

= \frac{1}{2} \cdot \int \frac{1}{v} d v

Use the common integral:

\int \frac{1}{v} d v = ln (∣ v ∣)

= \frac{1}{2} ln ∣ v ∣

Substitute back

= \frac{1}{2} ln cosh (x^{2} + 1)

Add a constant to the solution

= \frac{1}{2} ln cosh (x^{2} + 1) + C

What is the integral of xtanh(x^2+1) ?
The integral of xtanh(x^2+1) is 1/2 ln|cosh(x^2+1)|+C