been having trouble getting results in CAS system

01212018, 09:19 AM
Post: #1




been having trouble getting results in CAS system
...when using variables instead of numerics. I've encountered this kind of problem repeatedly....but this is a typical example.
The function I'm analyzing is y=(z^nx^n)^(1/n), n and z are integers. I'm only interested in x in the interval [0,z]. The equation for the length of the function curve in the interval [a,b] is: L=int((1+(dy/dx)^2)^(1/2),x,a,b).............integral So, I was hoping to get an equation in terms of z,n, a and b. So, I entered the following: y:=(z^nx^n)^(1/n) l:=int((1+(dy/dx)^2)^1/2,x,a,b) (it's lower case L). It hangs there for a minute or two as it calculates this, and then prints out a bunch of stuff, and when I hit enter again, it gives an integral as the result, rather than solving the integral. ??? Give it a try. Curious as to why it can't solve it. Then I tried n:=3 to solve for a specific case, and it printed a bunch of stuff again when I typed lower case L and I hit enter again, which gave me another giant complicated integral of a square root of a big polynomial plus an inverse polynomial. I tried setting a to 0, but none of these gives me an answer.... ....I know the probable answer is "it's too complex", but that seems like a copout.... any suggestions? Thanks. Donald 

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Messages In This Thread 
been having trouble getting results in CAS system  webmasterpdx  01212018 09:19 AM
RE: been having trouble getting results in CAS system  parisse  01222018, 07:03 AM
RE: been having trouble getting results in CAS system  webmasterpdx  01222018, 08:02 AM
RE: been having trouble getting results in CAS system  webmasterpdx  01222018, 09:39 AM
RE: been having trouble getting results in CAS system  parisse  01222018, 08:04 PM
RE: been having trouble getting results in CAS system  webmasterpdx  01242018, 09:02 AM
RE: been having trouble getting results in CAS system  parisse  01242018, 03:22 PM

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