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education/math/MATH1220 (calc II)/Integration with Trig Identities.md
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@ -34,7 +34,6 @@ This enables us to make use of **substitution** to simplify many integrals.
- $x = a\tan \theta$ - $x = a\tan \theta$
- $dx = a \sec^2\theta d\theta$ - $dx = a \sec^2\theta d\theta$
- for $-\frac{\pi}{2} < \theta < \frac{\pi}{2}$ - for $-\frac{\pi}{2} < \theta < \frac{\pi}{2}$
# Examples # Examples
> Evaluate the integral $\int\frac{3}{4+x^2}dx$ > Evaluate the integral $\int\frac{3}{4+x^2}dx$
1. Move the constant coefficient out of the integral: 1. Move the constant coefficient out of the integral: