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Mar 12

Calculus: why is 1^infinity not just 1?

  • when the limit of a function, through direct substitution, results in 1 to the power of infinity, you have to use L'Hospital's Rule instead of saying that this is equal to 1.

    Why is this?


  • These forms are called indeterminate because if you replace 1, 0, and
    infinity by functions the limits of which are 1, 0, and infinity as
    x -> 0, then the limit of the compound function does not exist, in the
    sense that the limit depends on which functions you choose.

    For an example of this discrepancy for 1^infinity, on the one hand,
    take f(x) = 1 and g(x) = 1/x. Then:

    lim f(x)^g(x) = lim 1^(1/x) = lim 1 = 1

    On the other hand, if we take f(x) = 1 + x and g(x) = 1/x, then:

    lim f(x)^g(x) = lim (1 + x)^(1/x) = e = 2.718281828459... > 1


  • its because 1^anything is 1 and anything to the infinity is infinity. so its both at the same time, so it doesnt work. so use lo's

    make it a good day


  • i think, for example 1^-1 is not 1 its .1 or something, i think, i don't know, i don't have a Calculator on me







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