1 Sets relations and functions
Let f : R → R be given by f(x) = ax+b / cx +d, a, b, c and d being non-zero real numbers. Its inverse f -1 (x) will be the same as f(x) provided 1) a + b = 0 2) a + c = 0 3) a + d = 0 4) b + c = 0
SOLUTION
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