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

The integral of 2/(e^x+2) is x-ln|e^x+2|+C

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integral of 2/(e^x+2)

\int \frac{2}{e ^{x} + 2} d x

x - ln ∣ e^{x} + 2 ∣ + C

Solution steps

\int \frac{2}{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} + 2} d x

Apply u-substitution

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

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

Take the partial fraction of

\frac{1}{u ( u + 2 )} : \frac{1}{2 u} - \frac{1}{2 ( u + 2 )}

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

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

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

\int \frac{1}{2 u} d u = \frac{1}{2} ln ∣ u ∣

\int \frac{1}{2 ( u + 2 )} d u = \frac{1}{2} ln ∣ u + 2 ∣

= 2 (\frac{1}{2} ln ∣ u ∣ - \frac{1}{2} ln ∣ u + 2 ∣)

Substitute back

u = e^{x}

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

Simplify

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

= x - ln ∣ e^{x} + 2 ∣

Add a constant to the solution

= x - ln ∣ e^{x} + 2 ∣ + C

f (x) = \frac{36 x}{x ^{2} + 36}, at x = - 3

\int \frac{x}{( 1 + x ) ^{3}} d x

\frac{\partial}{\partial x} (e^{3 x} cos (4 x))

\frac{d}{d t} (3 + 3 cos (t^{3}) - 4 sin (t^{3}))

x^{- 10}