Question: In problems, the density of a rod is given. Find c so that the mass from 0 to c is equal to 1. Whenever possible

In problems, the density of a rod is given. Find c so that the mass from 0 to c is equal to 1. Whenever possible find an exact solution. If this is not possible, find an approximation for c.
(a) δ(x) = 1/(x+1)
(b) δ(x) = 2/(x2+1)
(c) δ(x) = ln (x+1)

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