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y' = x sinα + y cosα
x' = 5 cos45 - 1 sin45
y' = 5 sin45 + 1 sin45
x' = 5.1/2√2 - 1.1/2√2
y' = 5.1/2√2 + 1.1/2√2
x' = 5/2√2 - 1/2√2
y' = 5/2√2 + 1/2√2
x' = 2√2
y' = 3√2
= (2√2 , 3√2)