Results 1 to 4 of 4

Math Help - Simple Derivative...Mental Lapse

  1. #1
    Junior Member
    Joined
    Oct 2007
    Posts
    40

    Simple Derivative...Mental Lapse

    I just totally had a mental lapse here...

    What's the derivative of TanSquaredX?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member

    Joined
    May 2006
    From
    Lexington, MA (USA)
    Posts
    11,682
    Thanks
    614
    Hello, Super Mallow!

    What's the derivative of: . f(x) \:=\:\tan^2\!x ?

    Think of it as: . f(x) \;=\;[\tan x]^2 .and use the Chain Rule.

    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Oct 2007
    Posts
    40
    Yup, I know that. This is actually really simple for me, but for some reason, I'm having a mental lapse on trig functions to a power right now!

    Is it 2(Times)sec2x?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by Super Mallow View Post
    Yup, I know that. This is actually really simple for me, but for some reason, I'm having a mental lapse on trig functions to a power right now!

    Is it 2(Times)sec2x?
    no. the chain rule says \frac d{dx}f(g(x)) = f'(g(x)) \cdot g'(x)

    you're missing something
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 0
    Last Post: November 1st 2009, 08:49 PM
  2. Mental calculation
    Posted in the Math Puzzles Forum
    Replies: 3
    Last Post: October 7th 2009, 08:01 AM
  3. Mental Blockage
    Posted in the Algebra Forum
    Replies: 2
    Last Post: April 25th 2009, 03:58 PM
  4. Mental calculus tips..
    Posted in the Algebra Forum
    Replies: 12
    Last Post: April 20th 2008, 06:45 AM
  5. [SOLVED] Mental math
    Posted in the Math Forum
    Replies: 2
    Last Post: September 30th 2007, 06:57 AM

Search Tags


/mathhelpforum @mathhelpforum