Find length of the curve

y=ln(cosx) {x,0,pi/2}

I am stuck and I dont know how to integrate sqrt(sec^2).

My Work:

Attachment 15714

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- March 1st 2010, 05:25 PMracewithferrariFinding the are of the curve
Find length of the curve

**y=ln(cosx) {x,0,pi/2}**

I am stuck and I dont know how to integrate sqrt(sec^2).

My Work:

Attachment 15714 - March 1st 2010, 05:45 PMskeeter
- March 1st 2010, 06:48 PMracewithferrari
I do not get it about dropping the absolute value.

I know what the integral of sqrt(sec^2) is . But I know dont know how I will solve it comes to Exams. - March 2nd 2010, 07:46 AMskeeter
you say this in your original post ...

Quote:

I am stuck and**I dont know how to integrate sqrt(sec^2).**

Quote:

**I know what the integral of sqrt(sec^2) is.**But I know dont know how I will solve it comes to Exams.

here is the arclength calculation ...