Sunday 31 January 2016

javascript - Why does Math.cos(90 * Math.PI/180) yield 6.123031769111... and not zero?

I convert degrees to radians (degrees * Math.PI/180) but why does the following:



Math.cos(90 * Math.PI/180)


yield 6.123031769111... and not zero?




I'm trying to perform 2D rotations uses matrixes and the results are completely out of whack.

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