Calculus/limits

Advertisement


Question
I'm confused on this question and I have a test tomorrow.
The limit x->infinity of (3x^4)*((sinx)/x) represents an asymptote. What value does it approach and does it ever cross the above value?

Answer

drawing
We know that sin(x) is always bounded between -1 & 1 . So our function will become :
[(3x^4)/x]*(sinx)=(3x^3)*M . Where -1<M<1 ("less or equal"). Therefore, as x moves forwards
toward infinity , the value of the function will alternate between +Inf & -Inf . Here's an
I attached you an image illustrating the above .
Note that the function 3x^3 rises as x goes to INF .

Alon.

Alon Mandes

Expertise

Kind of questions I can answer : Limits, Derivatives, Integration, Implicit functions, continuousity, differentiation ,Extremum problems, Lagrange multipliers, Gradients, Surface integrals, Multi variables functions ,Multi variables Integrals,Complex variables ,Complex functions, Curves, Trajectory integrals & Vector analyse,Divergence,Rotor & word problems. Kind of question I can't answer : Economics,Combinatorics,infinite series & convergence ,Statistics & Probabilities .

Experience

1. I'm a team member of mathnerds (math site for answering questions) 2. I'm a team member in the Student's Union of the Technion, helping students who have problems in mathematics. 3. 2 years of experience as a math teacher in college. 4. I give free homework help for high school students in Mathematics & Physics. 5. I teach part time in collage the subjects : "Digital Signal Processing" , "Random Signals & Noise" , "Complex Functions".

Organizations
Hi-Tech company : GSM4VOIP ; job possition : Algorythm developer.

Education/Credentials
M.A in Mathematics & Bs.c in Electronics.

©2012 About.com, a part of The New York Times Company. All rights reserved.