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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Desmos Atan2, This means, that the roll angle would be always zero.

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Why do the sine and cosine functions appear in areas of math and physics that have nothing to do with triangles? - Quora

trigonometry - Easy way of memorizing values of sine, cosine, and tangent - Mathematics Stack Exchange