What is the integral of cosh(2x)sinh(2x) ?

The integral of cosh(2x)sinh(2x) is 1/8 cosh(4x)+C

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integral of cosh(2x)sinh(2x)

\int cosh (2 x) sinh (2 x) d x

\frac{1}{8} cosh (4 x) + C

Solution steps

\int cosh (2 x) sinh (2 x) d x

Rewrite using trig identities

= \int \frac{1}{2} sinh (4 x) d x

Take the constant out:

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

= \frac{1}{2} \cdot \int sinh (4 x) d x

Apply u-substitution

: \int sinh (u) \frac{1}{4} d u

= \frac{1}{2} \cdot \int sinh (u) \frac{1}{4} d u

Take the constant out:

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

= \frac{1}{2} \cdot \frac{1}{4} \cdot \int sinh (u) d u

Use the common integral:

\int sinh (u) d u = cosh (u)

= \frac{1}{2} \cdot \frac{1}{4} cosh (u)

Substitute back

u = 4 x

= \frac{1}{2} \cdot \frac{1}{4} cosh (4 x)

Simplify

\frac{1}{2} \cdot \frac{1}{4} cosh (4 x) : \frac{1}{8} cosh (4 x)

= \frac{1}{8} cosh (4 x)

Add a constant to the solution

= \frac{1}{8} cosh (4 x) + C

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What is the integral of cosh(2x)sinh(2x) ?
The integral of cosh(2x)sinh(2x) is 1/8 cosh(4x)+C