anonymous
  • anonymous
Determine the limit
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
\[\lim x-> 0 \frac{ 3\sin4x }{ \sin3x }\]
anonymous
  • anonymous
sorry that's limit approaching zero lol
hartnn
  • hartnn
so do u know the basic limit of sin x/x =... ?

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More answers

anonymous
  • anonymous
yes it's = 1?
hartnn
  • hartnn
so, according to that formula , u need the denominator same as angle of sin. so, multiply and divide by 4x in numerator and multiply and divide by 3x in denominator
hartnn
  • hartnn
\(\huge \lim \limits_{x-> 0} \frac{ 3 \frac{4x.\sin4x}{4x} }{ 3x.\frac{\sin3x}{3x} }\)
zepdrix
  • zepdrix
That seems like a bit of overkill hart :o don't you just need 4x/4x?
hartnn
  • hartnn
yeah, thats correct, but i wanted to brig out the point that whenever you see sin ax , multiply and divide by ax
anonymous
  • anonymous
well can i bring out what's in the denominator first?
anonymous
  • anonymous
by multiplying the denominator by 3?
zepdrix
  • zepdrix
\[\large \lim_{x \rightarrow 0}\frac{4x}{4x}\frac{3\sin4x}{\sin3x} \quad = \quad 4\lim_{x \rightarrow 0}\frac{\sin4x}{4x}\frac{3x}{\sin3x}\]
zepdrix
  • zepdrix
Oh ok i see what you meant :)
zepdrix
  • zepdrix
The upside down one will also give you 1 swin.
zepdrix
  • zepdrix
It might make more sense if you look at the way hart wrote it out.
hartnn
  • hartnn
yeah, lim x->0 x/sin x also equals 1
anonymous
  • anonymous
chyea I'm trying to find a quicker way to solve for my final hahaha! i initially split them up so it was 3sin4x/1 * 1/sin3x. I'm not sure if that's legal
hartnn
  • hartnn
yeah, its legal step, but you will still need the form sin x/x so you need to multiply and divide by the angle of sin
anonymous
  • anonymous
So it will be 4?
zepdrix
  • zepdrix
\[\large \color{green}{Good}\quad \color{blue}{job!}\]
anonymous
  • anonymous
Lol thanks guys!! A couple of hours till I take my final :)
zepdrix
  • zepdrix
Oooo exciting! :O keep cramming. Sleep is good also.
hartnn
  • hartnn
do u need to show steps ?
hartnn
  • hartnn
because if you do, while taking the limit, you also need to show that 3x->0 and 4x-> 0
anonymous
  • anonymous
Probably not, because I think it's just simplifying it to make sinx/x = 1. But I understand how you solved it, Thanks for the review :)
hartnn
  • hartnn
ok, welcome ^_^

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