Results 1 to 2 of 2

Math Help - Questions on my test I didn't know how to solve.

  1. #1
    Member
    Joined
    Dec 2005
    Posts
    117

    Questions on my test I didn't know how to solve.

    1. Find the area of the surface generated by rotating the curve y=e^x, 0\leq x \leq 1 about the x-axis

    2. Prove that the length of the curve x=t-sint, y=1-cost, 0\leq t\leq 2\pi is 8.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Eater of Worlds
    galactus's Avatar
    Joined
    Jul 2006
    From
    Chaneysville, PA
    Posts
    3,001
    Thanks
    1
    #1. 2{\pi}\int_{0}^{1}e^{x}\sqrt{1+e^{2x}}dx

    #2. \frac{d}{dt}[t-sin(t)]=1-cos(t)

    \frac{d}{dt}[1-cos(t)]=sin(t)

    \int_{0}^{2{\pi}}\sqrt{(1-cos(t))^{2}+(sin(t))^{2}}dt= \int_{0}^{2{\pi}}\sqrt{2(1-cos(t))}dt
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 2
    Last Post: November 8th 2009, 03:18 PM
  2. 2 AP test questions I can't seem to solve
    Posted in the Calculus Forum
    Replies: 5
    Last Post: April 17th 2008, 11:05 PM
  3. Several questions I didn't get
    Posted in the Calculus Forum
    Replies: 3
    Last Post: March 6th 2008, 05:58 AM
  4. Replies: 2
    Last Post: September 16th 2007, 08:53 PM
  5. Didn't know to do this on test
    Posted in the Calculus Forum
    Replies: 4
    Last Post: July 6th 2006, 07:51 AM

Search Tags


/mathhelpforum @mathhelpforum