Primitive of Arctangent Function/Also presented as
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Primitive of Arctangent Function: Also presented as
This result can also be presented as:
- $\ds \int \arctan x \rd x = x \arctan x - \ln \sqrt {x^2 + 1} + C$
Proof
From Primitive of $\arccot x$:
- $\ds \int \arctan x \rd x = x \arctan x - \frac {\map \ln {x^2 + 1} } 2 + C$
The result follows by observing:
- $\dfrac 1 2 \log x = \log \sqrt x$
from Logarithm of Power.
$\blacksquare$
Sources
- 1976: K. Weltner and W.J. Weber: Mathematics for Engineers and Scientists ... (previous) ... (next): $6$. Integral Calculus: Appendix: Table of Fundamental Standard Integrals