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- - **The length of a curve with logaritm (Natural)**
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The length of a curve with logaritm (Natural)Hi guys the problem is to get the length of the curve y= ln(x^2-1) 0<= x <= 1/2As far as I am concerned we can use a formula L = $(from a to b) SQRT [1+ f'(x)] dx I don't know how to get the derivative of the function, could someone help me complete this task :wink: |

Re: The length of a curve with logaritm (Natural)In your formula, you need to square f'(x) in the radicand of the integrand. While the integral will return a real value, is it meaningful? The curve is not defined on [-1,1], although W|A shows it has a real and imaginary part on this interval. :? It looks like the same result would be returned by using which is defined on (-1,1). Also confusing to me is that W|A shows the same graph for both functions. |

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