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

Sine is the ratio of two sides of a triangle. How can it be

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

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353 questions with answers in SPECIAL RELATIVITY

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