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• Why sin 90 is 1? When the reference angle becomes 90 and the adjacent side becomes 0, the triangle is not a triangle anymore. - Quora

Why sin 90 is 1? When the reference angle becomes 90 and the adjacent side becomes 0, the triangle is not a triangle anymore. - Quora

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Why is sin 90 taken to be 1? - Quora

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Why sin 90 is 1? When the reference angle becomes 90 and the

Why is sin 90 taken to be 1? - Quora

How do you prove sin(90°-a) = cos(a)?

Why do we do trigonometry with only 90° angled triangles? Can't we