If x=phi (t), y=psi(t), then (d ^(2)y)/(...

If `x=phi (t), y=psi(t),` then `(d ^(2)y)/(dx ^(2))=`

`(phi'psi''-psi'phi'')/((phi')^(2))`

`(phi'psi''-psi'phi'')/((phi')^(3))`

`(psi'')/(phi') -(psi'phi'')/((phi')^(2))`

`(psi'')/((phi')^(2))-(psi'phi'')/((phi')^(3))`

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B, D

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