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smurfy14
 4 years ago
y=cos(0.4x) has a horizontal stretch of..? PLEASE HELP
smurfy14
 4 years ago
y=cos(0.4x) has a horizontal stretch of..? PLEASE HELP

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0are you looking for the period of \[\cos(.4x)\]?

smurfy14
 4 years ago
Best ResponseYou've already chosen the best response.0im looking for something like "it stretches X..."

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0period of \[\cos(x)\] is \[2\pi\] so period of \[\cos(bx)\] is \[\frac{2\pi}{b}\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0in your case you get \[\frac{2\pi}{.4}=5\pi\]

smurfy14
 4 years ago
Best ResponseYou've already chosen the best response.0no heres an example: y=3cos1/2x has a horizontal stretch of 2 but i cant figure out what it would be for this problem

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0so period goes from 2 pi to 5 pi

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0oooooooooooooooh silly way to word the problem. in your case \[\cos(\frac{1}{2}x)\] teh "stretch" was 2

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0in other words the reciprocal of coefficient. the reciprocal of .4 is 5, so stretch is 5

smurfy14
 4 years ago
Best ResponseYou've already chosen the best response.0ohhhkay so you dont have to include the whole thing like 2/5=5/2 you just take the numerator?
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