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An integral involving a square root of a quadratic often yields to a technique using sine, tangent or secant. That technique is:
ANumeric estimate
BImproper compare
CPartial fractions
DTrig substitution
Answer & Solution
Correct answer: D. Trig substitution
1. A trig function replaces the variable.
2. The radical then simplifies.
3. It is trig substitution.
_Source: OpenStax Calculus Volume 2, Chapter 3, Techniques of Integration._
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