Superb job of not giving away answers in the test suite.
The solutions for x<-1 would require y^2<0.
William, expand the right side.
Smallest distance between a point and a rectangle
Equal to their cube
Height of a right-angled triangle
Count numbers whose reciprocals' decimal expansions terminate
Compute the perimeter of an ellipse
List Proth primes
Compute a sum involving the totient over divisors of a number
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