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x' = x cos alpha-y sin alpha
x' = 5 x cos 270 - 8 sin 270
x'= 5 x 0 - 8 x (-1)
x' = 0+8
x' = 8
y' = x sin alpha + y cos alpha
y' = 5 x sin 270 + 8 x cos 270
y' = 5 x (-1) + 8 x 0
y' = (-5) + 0
y' = -5
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