Substitution is an integration technique used to simplify complex integrands by replacing variables with new ones that make integration easier.
Imagine you have a complicated math problem written on paper, but it's hard to solve directly. So, you decide to substitute the variables with new ones that make the problem simpler, just like using a code name for your friend in a secret message.
U-Substitution: U-substitution is a specific type of substitution where we let u represent an expression within the integrand.
Integration by Parts: Integration by parts is another integration technique that involves breaking down an integral into two parts and applying a specific formula.
Trigonometric Substitution: Trigonometric substitution is a method used when dealing with integrals involving square roots of quadratic expressions or trigonometric functions.
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