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

How is Cos 90°=0, Cos 0°=1 and Sin 90°=1? - Quora

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Sin 90 Degrees I Formula and its Derivation I Sample Examples

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

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