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Is there a difference when using sin, cos and tan with a 90 degree triangle and one without such a corner? - Quora
What is the value of sin(90)? - Quora
Prove that : (i) `sinthetacos(90^(@)-theta)+sin(90^(@)-theta
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Excuse me but WHAT THE F*** Quora!? Supporting child molestors now
How to find the sine of a 45 degree angle - Quora
Why is Sin (90 - a) = Cos(a) and Cos (90 - a) = Sin(a)? - Quora