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P(x,y)= 25,25
x= 25
y = 25
y = 4/3 x
m = tan a = 4/3
sin a = 4/5
cos a = 3/5
cos 2a = 1 - 2sin² a = 1 - 2(4/5)² = 1 - 32/25= - 7/25
sin 2a = 24/25
x' = x.cos 2a + y sin 2a
x' = 25 (-7/25) + 25(24/25)= - 7 + 24 = 17
y' = x sin 2a + y cos 2a
y' = 25(24/25) + 25(-7/25) = 24 - 7 = 17
(x'.y' )= (17, 17)