Why is [math]\sin (-90^\circ)=-1[/math]? - Quora

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What is the value of sin360°? - Quora

Another way to remember why Sin(90°) = 1 without memorizing the

Example 2 - In figure, ray OS stands on line POQ - Class 9

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Teaching math with the Drum Loop

trigonometry - Easy way of memorizing values of sine, cosine, and

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Why is cos t=sin (t+90)? - Quora

How can we get the trig table value without a calculator? Is there any trick that exists? - Quora

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