Primitive of Arcsine of a x
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Theorem
- $\ds \int \arcsin a x \rd x = x \arcsin a x + \dfrac 1 a \sqrt {1 - a^2 x^2} + C$
Proof
\(\ds \int \arcsin x \rd x\) | \(=\) | \(\ds x \arcsin x + \sqrt {1 - x^2} + C\) | Primitive of $\arcsin x$ | |||||||||||
\(\ds \leadsto \ \ \) | \(\ds \int \arcsin a x \rd x\) | \(=\) | \(\ds \dfrac 1 a \paren {\paren {a x} \arcsin a x + \sqrt {1 - \paren {a x}^2} } + C\) | Primitive of Function of Constant Multiple | ||||||||||
\(\ds \) | \(=\) | \(\ds x \arcsin a x + \dfrac 1 a \sqrt {1 - a^2 x^2} + C\) | simplifying |
$\blacksquare$
Also see
Sources
- 1968: George B. Thomas, Jr.: Calculus and Analytic Geometry (4th ed.) ... (previous) ... (next): Back endpapers: A Brief Table of Integrals: $96$.