if x=acos theta +bsin theta and y =asin theta - b cos theta,show that y^2d^2y/dx^2 - xdy/dx + y =0 - Maths - Introduction to Trigonometry

Question

if x=acos theta +bsin theta and y =asin theta - b cos theta,show
that y^2d^2y/dx^2 - xdy/dx + y =0

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