Why does sine squared plus cosine squared equal 1?

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

微積分学入門 - 三角法：三角関数の等式（57問中30問）証明 sin^2(x)=(1-cos2x)/2

How to prove that sin^2 x+ cos^2 x = 1 | [ Trigonometry ]

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Part 1: Exact Trig Values for Non Calculus

Proof: sin^2 + cos^2 = 1

1 upon secant squared theta minus cos squared theta + 1 upon cos squared theta minus

Proof of cos^2 theta + sin^2 theta = 1

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Trig Visualized: One Diagram to Rule them All (six trig functions in one diagram)

(1 + cos theta)/(1 - cos theta) = (cos ec*theta - cot theta) ^ 2 SSLC maths trigonometry #maths

Q37 | Prove that (1+sec⁡A)/sec⁡A = sin^2⁡A/(1-cos⁡A). | Trigonometry | CLASS X

Sin Theta,Cos Theta Kaha Use Kare!!😨😰|Ft.Alakh sir! #physicswallah #trending #motivation #alakhsir

Proof of the identity 1 + cot^2(theta) = cosec^2(theta) |Proved cot^2(x) + 1 = cosec^2(x)

Prove that Sin^2(A) + cos^2(A) ==1

cos theta / 1 + sin theta = 1 - sin theta / cos theta | Trigonometry class 10