Results 1 to 2 of 2

Math Help - Tanx+Sinx, need F'(x) & F"(x) to Sketch

  1. #1
    Newbie
    Joined
    Nov 2007
    Posts
    10

    Tanx+Sinx, need F'(x) & F"(x) to Sketch

    Okay the domain shoudl be straight forward

    D={x is All Reals except when x = Pi/2 + K(Pi)} where K is an Odd Interger

    A vertical Asymptote exists at Pi/2 + K(Pi) where K is an Odd Interger

    F'(x)

    just the addition rule, (tanx)' + (sinx)' = sec^2x + cosx

    so simpleify to cos

    you end up with 1+cos^3x/cos^2, I must be missing an identity to simplify this, any ideas?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Senior Member Peritus's Avatar
    Joined
    Nov 2007
    Posts
    397
    first of all not everything has to be simplified and second I think you better off staying in the first form --> cos(x) + sec^2(x) in order to find F''(x)
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 1
    Last Post: March 25th 2011, 01:27 AM
  2. Prove:(tanx/(1+tanx)) = (sinx/(sinx+cosx))
    Posted in the Trigonometry Forum
    Replies: 7
    Last Post: February 2nd 2011, 09:46 PM
  3. sinx + tanx > 2x
    Posted in the Trigonometry Forum
    Replies: 5
    Last Post: March 6th 2008, 03:14 PM
  4. Integrating (sinx + secx)/tanx dx
    Posted in the Calculus Forum
    Replies: 7
    Last Post: March 4th 2008, 09:30 AM
  5. Tanx+sinx, find f', f", intercepts than graph
    Posted in the Calculus Forum
    Replies: 0
    Last Post: November 23rd 2007, 10:56 AM

Search Tags


/mathhelpforum @mathhelpforum