Why can't you integrate #sqrt(1+(cosx/-sinx)^2#?
1 Answer
Jan 29, 2015
The answer is:
First of all it's useful to "change" a little the function:
I used the first fondamental relation of trigonometry:
So we have to integrate:
Before integrate this function, it is useful to remember the parametric formula of sinus, that says:
Now the integral will be done with the method of substitution:
Our integral becoms: