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

The integral of x/(cos(x)+1) is xtan(x/2)+2ln|cos(x/2)|+C

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

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

x tan (\frac{x}{2}) + 2 ln cos (\frac{x}{2}) + C

Solution steps

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

Apply Integration By Parts

= x tan (\frac{x}{2}) - \int tan (\frac{x}{2}) d x

\int tan (\frac{x}{2}) d x = - 2 ln cos (\frac{x}{2})

= x tan (\frac{x}{2}) - (- 2 ln cos (\frac{x}{2}))

Simplify

= x tan (\frac{x}{2}) + 2 ln cos (\frac{x}{2})

Add a constant to the solution

= x tan (\frac{x}{2}) + 2 ln cos (\frac{x}{2}) + C

What is the integral of x/(cos(x)+1) ?
The integral of x/(cos(x)+1) is xtan(x/2)+2ln|cos(x/2)|+C