sin 90° = 1 (Why & How?)

Sin 90 Degrees I Formula and its Derivation I Sample Examples

Sin 30 Degrees- Complete Details - Edureify-Blog

trigonometry - Why does sin(90)=1, and not 0? - Mathematics Stack Exchange

Gujrati] If tantheta=1/(sqrt3), find the value of sin (90^(@)-theta)

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How to remember the values of sin 60, sin 30, sin 45, etc?

Sin( 90 theta ) = cos theta prove this using coordinate axes

Why is sin 90 taken to be 1? - Quora

The unit circle and sine and cosine graphs, with the point a = 90°