What curved ramp transports a ball from (1,1) to (0,0) most quickly, under the acceleration of gravity, with no friction or air resistance?

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An infinitisemally small ball is placed at the top of a ramp which has a height of 1m and ends 1m away horizontally. What is the optimal curve of the ramp to minimize time taken for the ball to reach the base? I've tried a spreadsheet simulation of quadratic, cubic, circular and cycloidal functions; and the best so far seems to be the cycloid. Is this true; can it be proven? Thanks