Primitive of Cosine of a x over p plus q of Sine of a x
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Theorem
- $\ds \int \frac {\cos a x \rd x} {p + q \sin a x} = \frac 1 {a q} \ln \size {p + q \sin a x} + C$
Proof
\(\ds \map {\frac \d {\d x} } {p + q \sin a x}\) | \(=\) | \(\ds a q \cos a x\) | Derivative of $\sin a x$ | |||||||||||
\(\ds \leadsto \ \ \) | \(\ds \int \frac {\cos a x \rd x} {p + q \sin a x}\) | \(=\) | \(\ds \frac 1 {a q} \ln \size {p + q \sin a x} + C\) | Primitive of Function under its Derivative |
$\blacksquare$
Also see
Sources
- 1968: Murray R. Spiegel: Mathematical Handbook of Formulas and Tables ... (previous) ... (next): $\S 14$: Integrals involving $\sin a x$ and $\cos a x$: $14.416$