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

The integral of (1+x^2)^{1/2} is 1/2 x(x^2+1)^{1/2}+1/2 ln|x+sqrt(1+x^2)|+C

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integral of (1+x^2)^{1/2}

integral

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

\frac{1}{2} x (x^{2} + 1)^{\frac{1}{2}} + \frac{1}{2} ln x + 1 + x^{2} + C

Solution steps

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

Apply Trigonometric Substitution

: \int sec^{3} (u) d u

= \int sec^{3} (u) d u

Apply Integral Reduction

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

\int sec (u) d u = ln ∣ tan (u) + sec (u) ∣

= \frac{sec ^{2} ( u ) sin ( u )}{2} + \frac{1}{2} ln ∣ tan (u) + sec (u) ∣

Substitute back

u = arctan (x)

= \frac{sec ^{2} ( arctan ( x ) ) sin ( arctan ( x ) )}{2} + \frac{1}{2} ln ∣ tan (arctan (x)) + sec (arctan (x)) ∣

Simplify

\frac{sec ^{2} ( arctan ( x ) ) sin ( arctan ( x ) )}{2} + \frac{1}{2} ln ∣ tan (arctan (x)) + sec (arctan (x)) ∣ : \frac{1}{2} x (x^{2} + 1)^{\frac{1}{2}} + \frac{1}{2} ln x + 1 + x^{2}

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

Add a constant to the solution

= \frac{1}{2} x (x^{2} + 1)^{\frac{1}{2}} + \frac{1}{2} ln x + 1 + x^{2} + C

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

\frac{e ^{x}}{x ^{2}}

e^{\frac{- x}{2}}

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

t^{3} + 3 t^{2} - 2 t + t^{- 1}

What is the integral of (1+x^2)^{1/2} ?
The integral of (1+x^2)^{1/2} is 1/2 x(x^2+1)^{1/2}+1/2 ln|x+sqrt(1+x^2)|+C