Why is [math]\sin (-90^\circ)=-1[/math]? - Quora
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What is the value of sin360°? - Quora
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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
If sin theta =√3/2, calculate tan (90-theta) °? - Sums & Series (Maths) - Quora