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0.5*((-k*(2*(x-0.5))-(2*(x-0.5)))/(2*-k*(2*(x-0.5))-(-k)-1))+0.5, x from 0.5 to 1, k from -1 to 1
0.5*((-k*(2*(x-0.5))-(2*(x-0.5)))/(2*-k*(2*(x-0.5))-(-k)-1))+0.5, x from 0.5 to 1, k from -1 to 1
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