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[" 1) "[" 1."x=25," is "26" carry "2" ma...

[" 1) "[" 1."x=25," is "26" carry "2" marks each."],[*" If "x=a cos theta+b sin theta,y=a sin theta-b cos theta," show that "y^(2)(d^(2)y)/(dx^(2))-x(dy)/(dx)+y=0," ."],[" ite the coordinates of the neins."]]

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