What is the integral of 2/((e^x+e^{-x))^2} ?

The integral of 2/((e^x+e^{-x))^2} is -1/(e^{2x)+1}+C

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integral of 2/((e^x+e^{-x))^2}

integral

\frac{2}{( e ^{x} + e ^{- x} ) ^{2}}

- \frac{1}{e ^{2 x} + 1} + C

Solution steps

\int \frac{2}{( e ^{x} + e ^{- x} ) ^{2}} d x

Take the constant out:

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

= 2 \cdot \int \frac{1}{( e ^{x} + e ^{- x} ) ^{2}} d x

Factor

\frac{1}{( e ^{x} + e ^{- x} ) ^{2}}

= 2 \cdot \int \frac{1}{( e ^{- x} ( e ^{2 x} + 1 ) ) ^{2}} d x

(e^{- x} (e^{2 x} + 1))^{2} = e^{2 x} + 2 + e^{- 2 x}

= 2 \cdot \int \frac{1}{e ^{2 x} + 2 + e ^{- 2 x}} d x

Apply u-substitution

: \int \frac{1}{2 ( u ^{2} + 2 u + 1 )} d u

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

Take the constant out:

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

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

Complete the square

u^{2} + 2 u + 1 : (u + 1)^{2}

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

Apply u-substitution

: \int \frac{1}{v ^{2}} d v

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

Apply the Power Rule

: - \frac{1}{v}

= 2 \cdot \frac{1}{2} (- \frac{1}{v})

Substitute back

= 2 \cdot \frac{1}{2} (- \frac{1}{e ^{2 x} + 1})

Simplify

2 \cdot \frac{1}{2} (- \frac{1}{e ^{2 x} + 1}) : - \frac{1}{e ^{2 x} + 1}

= - \frac{1}{e ^{2 x} + 1}

Add a constant to the solution

= - \frac{1}{e ^{2 x} + 1} + C

\frac{1}{t ^{2}} \cdot \frac{e ^{- 1}}{t}

- 2 tan (x)

\frac{( cos ^{2} ( x ) + 1 )}{2}

\frac{- x}{3}

e^{x} \cdot x^{3}

What is the integral of 2/((e^x+e^{-x))^2} ?
The integral of 2/((e^x+e^{-x))^2} is -1/(e^{2x)+1}+C