Why does sine squared plus cosine squared equal 1?

Proof: sin^2 + cos^2 = 1

Why sin^2+cos^2=1?

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Why sin^2(x) + cos^2(x) = 1? | Proof Of Trigonometric Identities

sin square theta + cos square theta = 1 How to prove?

sin^2+cos^2=1 veranschaulicht am Einheitskreis mit Satz des Pythagoras | Mathe by Daniel Jung

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Prove cos^2x-sin^2x=2cos^2x-1

sin^2x+cos^2x=1 Proof |Mad Teacher

sin2 + cos2=1

Trigonometry Identity: Proof that sin^2(x) + cos^2(x) = 1

why sin(2x)=2sin(x)cos(x)

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cos^2(1 + tan^2) = 1

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