Primitive of x squared over Root of x squared plus a squared

Theorem

Inverse Hyperbolic Sine Form

$\ds \int \frac {x^2 \rd x} {\sqrt {x^2 + a^2} } = \frac {x \sqrt {x^2 + a^2} } 2 - \frac {a^2} 2 \sinh^{-1} \frac x a + C$

Logarithm Form

$\ds \int \frac {x^2 \rd x} {\sqrt {x^2 + a^2} } = \frac {x \sqrt {x^2 + a^2} } 2 - \frac {a^2} 2 \map \ln {x + \sqrt {x^2 + a^2} } + C$

Also see

• Primitive of Reciprocal of $\dfrac {x^2} {\sqrt {x^2 - a^2} }$
• Primitive of Reciprocal of $\dfrac {x^2} {\sqrt {a^2 - x^2} }$