Trigonometric Integrals 3: The Square to Double-Angle Formulas

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We use the Square to Double-Angle Formulas (cos^2(x) = [1 + cos(2x)]/2 and sin^2(x) = [1 - cos(2x)]/2) to compute integrals whose integrands involve squared sine and cosine functions.
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This video helped me understand trig identities in under 2 minutes in what I couldn't grasp in years.

aidensparks