Precalculus Quiz
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TRIGONOMETRIC IDENTITIES
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Based on the unit circle, a point (x,y)(x,y) on the unit circle satisfies x2+y2=1x^2+y^2=1. How is the identity sin⁡2(θ)+cos⁡2(θ)=1\sin^2(\theta)+\cos^2(\theta)=1 derived from this fact?
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