What is the integral of 1/(5+5cos(x)) ?

The integral of 1/(5+5cos(x)) is 1/5 tan(x/2)+C

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integral of 1/(5+5cos(x))

\int \frac{1}{5 + 5 cos ( x )} d x

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

Solution steps

\int \frac{1}{5 + 5 cos ( x )} d x

Factor

\frac{1}{5 + 5 cos ( x )}

= \int \frac{1}{5 ( cos ( x ) + 1 )} d x

Take the constant out:

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

= \frac{1}{5} \cdot \int \frac{1}{cos ( x ) + 1} d x

Apply u-substitution

: \int 1 d u

= \frac{1}{5} \cdot \int 1 d u

Integral of a constant:

\int a d x = a x

= \frac{1}{5} \cdot 1 \cdot u

Substitute back

u = tan (\frac{x}{2})

= \frac{1}{5} \cdot 1 \cdot tan (\frac{x}{2})

Simplify

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

Add a constant to the solution

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

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What is the integral of 1/(5+5cos(x)) ?
The integral of 1/(5+5cos(x)) is 1/5 tan(x/2)+C