How do you find the limit of #x/(x-1) - 1/(ln(x))# as x approaches 1?
Gather terms into a single ratio and apply L'Hopital's rule twice to find
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To find the limit of the given expression as x approaches 1, we can use algebraic manipulation and the properties of limits.
First, let's simplify the expression:
x/(x-1) - 1/(ln(x))
To combine the fractions, we need a common denominator. The common denominator is (x-1)ln(x).
Multiplying the first fraction by ln(x)/ln(x) and the second fraction by (x-1)/(x-1), we get:
(xln(x))/(x-1)ln(x) - (x-1)/(ln(x)(x-1))
Now, we can combine the fractions:
[(xln(x)) - (x-1)] / [(x-1)ln(x)]
Next, we can simplify further:
[xln(x) - x + 1] / [(x-1)ln(x)]
Now, we can factor out x from the numerator:
x(ln(x) - 1 + 1/x) / [(x-1)ln(x)]
Canceling out the common factor of (x-1) in the denominator and numerator, we have:
x(ln(x) - 1 + 1/x) / [ln(x)]
Now, we can evaluate the limit as x approaches 1.
Substituting x = 1 into the expression, we get:
1(ln(1) - 1 + 1/1) / [ln(1)]
Since ln(1) = 0, the expression becomes:
1(0 - 1 + 1/1) / [0]
Simplifying further, we have:
1(-1 + 1) / [0]
Which simplifies to:
0 / [0]
This is an indeterminate form, so we need to apply L'Hôpital's rule.
Differentiating the numerator and denominator with respect to x, we get:
d/dx [x(ln(x) - 1 + 1/x)] / d/dx [ln(x)]
Using the product rule and chain rule, we have:
[(ln(x) - 1 + 1/x) + x(1/x - 1/x^2)] / (1/x)
Simplifying further, we get:
[(ln(x) - 1 + 1/x) + (1 - 1/x)] / (1/x)
Combining like terms, we have:
[ln(x) - 1 + 1/x + 1 - 1/x] / (1/x)
Simplifying, we get:
[ln(x)] / (1/x)
Multiplying by x/x, we have:
[xln(x)] / 1
Which simplifies to:
xln(x)
Now, we can evaluate the limit as x approaches 1.
Substituting x = 1 into the expression, we get:
1ln(1)
Since ln(1) = 0, the expression becomes:
1(0)
Which equals:
0
Therefore, the limit of x/(x-1) - 1/(ln(x)) as x approaches 1 is 0.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
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