Linear Algebra: Rotation Transformations

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This is so much better than Khan Academy. Khan Academy makes it so stupidly confusing, drawing lines everywhere etc. This is nice, and simple. Thank you

t-h
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I think if you multiply the matrix for 45 degrees by square root 2 rather than reciprocal ? Also this was the best explanation for rotation transformations I've seen so far.

jimkella
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What about in R3 about the x axis and the z axis.

jonathandwyer
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Sin45 or cos45 doesn't equal that you write its equal to under root 1/2

KhalidKhan-hiqk