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

サイン二乗とコサイン二乗が 1 になるのはなぜですか?

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

Prove that sin square theta + cos square theta =1 | class 10th | Trigonometric Identities

三角法の恒等式: sin^2(x) + cos^2(x) = 1 の証明

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