anonymous
  • anonymous
x=2t y=3t^2 0<= t <= 1 Evaluate the integral
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
\[\int\limits_{}^{}(x-y)ds\]
myininaya
  • myininaya
surface area?
myininaya
  • myininaya
ok

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myininaya
  • myininaya
what is ds?
anonymous
  • anonymous
ds is the line integral which equals sqrt( (dx/dt)^2 + (dy/dt)^2 dt)
myininaya
  • myininaya
ok cool give me just a sec i will scan in something
anonymous
  • anonymous
okay
myininaya
  • myininaya
is that dt outside the sqrt?
anonymous
  • anonymous
no its underneath atleast thats what it seems like in my book go here:http://tutorial.math.lamar.edu/Classes/CalcIII/LineIntegralsPtI.aspx The equation is the 2nd blue one
myininaya
  • myininaya
its outside
anonymous
  • anonymous
okay it just looks like its inside
myininaya
  • myininaya
i had to use integration by parts. it is long problem and maybe i'm going about the long way and there is a shorter way, but I got you started
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myininaya
  • myininaya
don't do it htis way there has to be a shorter way
myininaya
  • myininaya
lol
anonymous
  • anonymous
haha I really appreciate the help, that is exactly where I got to in the problem
anonymous
  • anonymous
I got to \[2\int\limits_{0}^{1}(2t-3t^2)(\sqrt{9t^2+1}\] and after that is where I am getting stuck trying to evaluate the integral
myininaya
  • myininaya
we could try integration by parts but that is messy I have the answer do you want it?
myininaya
  • myininaya
-(1/6)*t*(1+9*t^2)^(3/2)+(1/12)*t*sqrt(1+9*t^2)+(1/36)*arcsinh(3*t)+(4/27)*(1+9*t^2)^(3/2)
anonymous
  • anonymous
yeah that is pretty messy it seems like it should be a lot easier than what we have you know. I got the same thing off of wolframalpha
myininaya
  • myininaya
even the answer with the limits is messy
anonymous
  • anonymous
yeah I know right and this is just a take home quiz idk. Its just that square root that is making messy like that
myininaya
  • myininaya
wait...
myininaya
  • myininaya
omg i got it one sec let me write it neatly
anonymous
  • anonymous
haha okay I sure hope so...my brain is fried lol
myininaya
  • myininaya
ok im posting this but i'm pretty sure i made a mistake somewhere but the problem is easy than we thought
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anonymous
  • anonymous
that is certainly a lot easier than how we were doing it and a much cleaner answer
myininaya
  • myininaya
i messed up on my addition lol
anonymous
  • anonymous
haha around which part?
myininaya
  • myininaya
finding the antiderivative of u^(3/2)
anonymous
  • anonymous
okay I see..one dumb addition mistake lol
anonymous
  • anonymous
I dont think I can thank you enough tho, This most certainly helped me out tremendously, I def needed some help on this problem. Thank you again

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