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logarithmic functions

A function is logarithmic if it has this algebraic expression:

Its domain is (0,∞) and its range is R, and it has no symmetry. It is decreasing if 0 < a < 1, or increasing if a > 1, in its domain. It has no extrema. The graph always contains  (1,0).





Exercise: draw the graph of f(x) =  log2x