Solving coupled non-linear equations

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I am struggling to understand what the following question requires me to do:enter image description here

I believe I need to differentiate implicitly, but am unsure how I show it cannot be done.

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Compute the total differentials: $$3x^2dx+e^ydy=ds,\\-\sin xdx+y dx+x dy=dt.$$ At $(x,y)=(0,0)$,

$$0dx+dy=ds,\\0dx+0dy=dt.$$ The Jacobian matrix of the transform is singular.