Solve f(x)=sin(x/2)

  • Thread starter frenkie
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  • #36
d_leet
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frenkie said:
end behavior is a straight line going to negative and positive infinity?

What are you talking about? What does the graph of the function y = sin(x) look like?
 
  • #37
frenkie
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its an even graph going up to 1 and down to -1...
 
  • #38
HallsofIvy
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No, it's not. Since your idea of solving math problems appears to be punching calculator keys, more or less at random, how about graphing sin(x) on a calculator and looking at it?
 
  • #39
arildno
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As a follow-up to Halls' suggestion, let Xmin=-20, Xmax=20, Ymin=-1, Ymax=1 (on the Window menu).

What does the graph tell you?
 
  • #40
frenkie
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it tells you that the roots of sin(x/2) are at -2Pi, o and 2Pi? this is HARD!
 
  • #41
d_leet
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frenkie said:
it tells you that the roots of sin(x/2) are at -2Pi, o and 2Pi? this is HARD!

Yes... But there are a lot more zeros than that... What do you know about the sine function?
 
  • #42
frenkie
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well its an even function...limits at negative and positive infinity...root at zero? what do u mean when u say there are alot more zeros?
 
  • #43
d_leet
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frenkie said:
well its an even function...limits at negative and positive infinity...root at zero? what do u mean when u say there are alot more zeros?

How can you be asking these questions when you are supposed to be finding the extrema of this function? Surely you must be in a calculus class, and in my experience most calculus classes require some prerequisite knowledge of trigonometry and trigonometric functions. You do realize that the sine funtion is a trigonometric fundtion right?

Next, What does it mean mathematically for a function to be even? Because f(x) = sin(x) is absolutely not an even function.

If a function is even it satisfies the following equlity.
f(x) = f(-x)
graphically this means that the function is symmetric about the y axis.

I have no clue what you mean by "limits at positive and negative infinity" because you give no context for them in the post I have quoted.

And when I say there are a lot more than three zeros, I specifically mean that there are an infinite number of zeros for the function y = sin(x/2) just as there are of the function y = sin(x). If you do not know this you are in no position to be speaking of the limits as x goes to positive or negative infinity, or finding the local extrema of this function. I suggest that you do a bit of research on the sine function before you make any more attempts at this problem.
 
  • #44
frenkie
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can u tell me what is greater then 2Pi on a unit circle? please. thats what i need to know.
 
  • #45
d_leet
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frenkie said:
can u tell me what is greater then 2Pi on a unit circle? please. thats what i need to know.

What are you talking about?
 
  • #46
frenkie
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what is greater then 2Pi on a unit circle? it has nothing to do with this problem, i just need to know.
 
  • #47
frenkie
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what is greater then 2Pi on a unit circle? it has nothing to do with this problem i just need to know.
 
  • #48
d_leet
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frenkie said:
what is greater then 2Pi on a unit circle? it has nothing to do with this problem, i just need to know.

It would really help if you would give some context as to what you are talking about, however I would suppose that 3pi, 4pi, 5pi, 1729pi etc.. would all be greater that 2pi...
 
  • #49
HallsofIvy
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You are trying to do Calculus problems when you cannot do basic algebra or even arthmetic. I strongly urge you to go to your teacher. You have far worse problems than we can help you with.
 

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