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AP® Calculus AB-BC

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Moderate

Substitution 2

APCALC-8RD4JL

Evaluate the following:

$$\int { \cfrac { x }{ \sqrt { 1+{ x }^{ 2 } } } } dx$$

A

$\arctan { x } +C$

B

$\cfrac{1}{2}\arctan { x } +C$

C

$2\arctan { x } +C$

D

$\sqrt{ { ( 1+{ x }^{ 2 } )} }+C$