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I understand how to do the rotation equation

A = [ cosθ -sinθ

sinθ cosθ]

A*v = [ cosθ -sinθ * [ x = [ xcosθ - ysinθ

sinθ cosθ] y ] xsinθ + ycosθ ]

A*v = [ cos90 -sin90 * [ 6

sin90 cos90 ] 4 ]

= [ 0, -1 * [ 6 = [ 0 * 6 - 1 * 4 = [ -4

1, 0 ] 4 ] 1 * 6 + 0 * 4 ] 6 ]

but the text book I am using doesn't go into using different angle as you can see this is a 90 degree equation but what if I wanted to use 30 degrees or 5 degree instead.I have look on the internet for some advice but don't seem to be able to find some?

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# Linear algebra rotation

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