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Derive an identity for cos(2theta), done fast in 56 seconds
Trigonometry - Overview and Identities (16 of TBD) sin(theta/2) Derived
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If `A=[[cos 2 theta, sin 2 theta],[-sin2theta, cos2theta]]`, find `A^2`
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Prove that sin(2 theta)=2sin theta cos theta.
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solving a trigonometric equation sin(2x)=cos(x) with the double angle identity, precalculus tutorial
Verify tan theta - cot theta = (sin^2(theta) - cos^2(theta))/(sin theta * cos theta)