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Calculus review!

by hodeez
Tags: calculus, review
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hodeez
#1
Dec17-03, 03:31 PM
P: 28
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
File Type: doc reviewsheet.doc (39.5 KB, 29 views)
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hodeez
#2
Dec17-03, 03:33 PM
P: 28
for #1
i got 3x^2-sin(xy^2)*2xy [dy/dx]*y^2
whadaya thinks?
hodeez
#3
Dec17-03, 03:36 PM
P: 28
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?

hodeez
#4
Dec17-03, 03:40 PM
P: 28
Calculus review!

#3) f'(x)=2+cosx so we have to prove f'(x) is constantly positive or negative.. but how would we approach that?
NateTG
#5
Dec17-03, 03:46 PM
Sci Advisor
HW Helper
P: 2,537
Originally posted by hodeez
#3) f'(x)=2+cosx so we have to prove f'(x) is constantly positive or negative.. but how would we approach that?
What's the minimum of cos(x) (assuming x is real)
hodeez
#6
Dec17-03, 03:53 PM
P: 28
Originally posted by NateTG
What's the minimum of cos(x) (assuming x is real)
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
NateTG
#7
Dec17-03, 04:24 PM
Sci Advisor
HW Helper
P: 2,537
So, if the minimum value of cos(x) is -1, what is the minimum value of 2+cos(x)?
hodeez
#8
Dec17-03, 04:35 PM
P: 28
lol wow i feel so dumb

thanks onward to the next question after i finish some quick job for my boss.
hodeez
#9
Dec17-03, 04:42 PM
P: 28
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?
hodeez
#10
Dec18-03, 11:10 AM
P: 28
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
himanshu121
#11
Dec18-03, 11:10 PM
himanshu121's Avatar
P: 658
d/dx{x+sin(xy)} = 1 +cos(xy)[xdy/dx+y]
hodeez
#12
Dec19-03, 10:56 AM
P: 28
oh my goddd what did i do!?! i messed up.. oh wells
thanks himanshu121 for reminding me of my errror


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