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x=tcost & y=t+sint then find dx2/d2y

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  1. The symbol
    dx2/d2y
    doesn't make sense.

    Do you want d/dy (dx/dy) = d^2x/dy^2 ?

    You can get dx/dy parametrically in terms of t using

    dx/dy = (dx/dt)/(dy/dt)

    After that, you can use the chain rule for d^2/dy^2. It will still be in terms of t.

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