What is the integral of 3/(8+7cos(x)) ?

The integral of 3/(8+7cos(x)) is (2sqrt(3))/(sqrt(5))arctan(1/(sqrt(15))tan(x/2))+C

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integral of 3/(8+7cos(x))

\int \frac{3}{8 + 7 cos ( x )} d x

\frac{2 3}{5} arctan (\frac{1}{15} tan (\frac{x}{2})) + C

Solution steps

\int \frac{3}{8 + 7 cos ( x )} d x

Take the constant out:

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

= 3 \cdot \int \frac{1}{8 + 7 cos ( x )} d x

Apply u-substitution

: \int \frac{2}{u ^{2} + 15} d u

= 3 \cdot \int \frac{2}{u ^{2} + 15} d u

Take the constant out:

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

= 3 \cdot 2 \cdot \int \frac{1}{u ^{2} + 15} d u

Apply Integral Substitution

= 3 \cdot 2 \cdot \int \frac{1}{15 ( v ^{2} + 1 )} d v

Take the constant out:

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

= 3 \cdot 2 \cdot \frac{1}{15} \cdot \int \frac{1}{v ^{2} + 1} d v

Use the common integral:

\int \frac{1}{v ^{2} + 1} d v = arctan (v)

= 3 \cdot 2 \cdot \frac{1}{15} arctan (v)

Substitute back

= 3 \cdot 2 \cdot \frac{1}{15} arctan (\frac{tan ( \frac{x}{2} )}{15})

Simplify

3 \cdot 2 \cdot \frac{1}{15} arctan (\frac{tan ( \frac{x}{2} )}{15}) : \frac{2 3}{5} arctan (\frac{1}{15} tan (\frac{x}{2}))

= \frac{2 3}{5} arctan (\frac{1}{15} tan (\frac{x}{2}))

Add a constant to the solution

= \frac{2 3}{5} arctan (\frac{1}{15} tan (\frac{x}{2})) + C

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What is the integral of 3/(8+7cos(x)) ?
The integral of 3/(8+7cos(x)) is (2sqrt(3))/(sqrt(5))arctan(1/(sqrt(15))tan(x/2))+C