diff --git a/education/math/MATH1220 (calc II)/Integration with Trig Identities.md b/education/math/MATH1220 (calc II)/Integration with Trig Identities.md
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+The below integration makes use of the following trig identities:
+1. The Pythagorean identity: $\sin^2(x) + \cos^2(x) = 1$
+2. The derivative of sine: $\frac{d}{dx}sin(x) = cos(x)$
+3. The derivative of cosine: $\dfrac{d}{dx} \cos(x) = -\sin(x)$
+$$ \cos^2(x) = \frac{}