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After a 90° counterclockwise axes rotation, a point is (2, 5) in the new system. Originally it was
A(5, -2)
B(-5, 2)
C(5, 2)
D(2, 5)
Answer & Solution
Correct answer: B. (-5, 2)
Using x = x'cosθ - y'sinθ and y = x'sinθ + y'cosθ at 90° gives x = -5 and y = 2.
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