Calculus review!

  1. Hi guys, I have a calculus test tomorrow and it'll be great if I can recieve some answers + explanations! my review sheet is attached. if this is breaking the rules im sorry.

    hope this actually helps some other people too
     

    Attached Files:

    Last edited: Dec 17, 2003
  2. jcsd
  3. for #1
    i got 3x^2-sin(xy^2)*2xy [dy/dx]*y^2
    whadaya thinks?
     
  4. for #2) its log(x)/log4 b)then graph it with my TI89 then find the deriv @ .4


    at work right now so no calculator on me =)
    btw: does the TI89 have a test function == like the ti86?
     
  5. #3) f'(x)=2+cosx so we have to prove f'(x) is constantly positive or negative.. but how would we approach that?
     
  6. NateTG

    NateTG 2,537
    Science Advisor
    Homework Helper

    What's the minimum of cos(x) (assuming x is real)
     
  7. sorry im not quite following you. on the y axis it is -1, and on the x it can be -infinite. please correct me if im wrong
     
  8. NateTG

    NateTG 2,537
    Science Advisor
    Homework Helper

    So, if the minimum value of cos(x) is -1, what is the minimum value of 2+cos(x)?
     
  9. lol wow i feel so dumb

    thanks onward to the next question after i finish some quick job for my boss.
     
  10. i got x-4=y^3+y
    so turn my ti89 to parametric mode and y1 = t^3+t
    y2= -1 right? (since its g(3) 3-4 = -1)
    then i trace for a zero?
     
    Last edited: Dec 17, 2003
  11. just came back from my test and i got confused on a question... find the deriv of x+sin(xy) i got (-sec(x)-y)/x but the calc gave me 1

    thanks to all the people that replied and (attempted to) help
     
  12. d/dx{x+sin(xy)} = 1 +cos(xy)[xdy/dx+y]
     
  13. oh my goddd what did i do!?! i messed up.. oh wells :smile:
    thanks himanshu121 for reminding me of my errror
     
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