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Questions  

If the axes are rotated through an angle of 30° in clockwise direction, the point (4, 23) in the new system is

a
(2, 3)
b
(2,3)
c
(3, 2)
d
(3, 5)

detailed solution

Correct option is D

We have x=4,y=23 and θ=−30∘∴ X=xcos⁡θ+ysin⁡θ and Y=−xsin⁡θ+ycos⁡θ⇒ X=4cos⁡30∘−23sin⁡30∘Y=+4sin⁡30∘+23cos⁡30∘=X=3 and Y=5Hence, the given point in the new system is (3,5)

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