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[" 48.If "x=a cos theta+b sin theta" and...

[" 48.If "x=a cos theta+b sin theta" and "y=a sin theta-b cos theta" ,show "],[" that "y^(2)(d^(2)y)/(dx^(2))-x(dy)/(dx)+y=0" ,"|" Dethi "2015" ,Fercient "2" at "]

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