What is the integral of usqrt(1+u^2) ?

The integral of usqrt(1+u^2) is 1/3 (1+u^2)^{3/2}+C

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integral of usqrt(1+u^2)

\int u 1 + u^{2} d u

\frac{1}{3} (1 + u^{2})^{\frac{3}{2}} + C

Solution steps

\int u 1 + u^{2} d u

Apply u-substitution

: \int v^{2} d v

= \int v^{2} d v

Apply the Power Rule

: \frac{v ^{3}}{3}

= \frac{v ^{3}}{3}

Substitute back

v = 1 + u^{2}

= \frac{( 1 + u ^{2} ) ^{3}}{3}

Simplify

\frac{( 1 + u ^{2} ) ^{3}}{3} : \frac{1}{3} (1 + u^{2})^{\frac{3}{2}}

= \frac{1}{3} (1 + u^{2})^{\frac{3}{2}}

Add a constant to the solution

= \frac{1}{3} (1 + u^{2})^{\frac{3}{2}} + C

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What is the integral of usqrt(1+u^2) ?
The integral of usqrt(1+u^2) is 1/3 (1+u^2)^{3/2}+C