trigonometry - Trouble visualizing sin and cos - Mathematics Stack

I'm working on building tetris now in Java and am at the point of rotations I originally hardcoded all of the rotations, but found that linear algebra was the better way to go. I'm trying to u

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Helpful visualisation of trigonometric functions. : r/math

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Cos (90-A) sin (90-A) /tan (90-A) = sin ^2A prove that - Maths

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

Prove rightarrow sin (90^{o}-theta)cos (90^{o}-theta)=dfrac {tan theta}{1+tan ^{2}theta}

Why does the trigonometric function change at 90 and 270 degrees? Like sin to cos, tan to cot : r/JEENEETards