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burhan101 Group TitleBest ResponseYou've already chosen the best response.0
\[\huge A(t)= 20\sin^2(\frac{ t }{ 1000\pi })\]
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.2
Use power + chain rules
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.2
This is a very straightforward question.
 one year ago

burhan101 Group TitleBest ResponseYou've already chosen the best response.0
dw:1371609626141:dw
 one year ago

burhan101 Group TitleBest ResponseYou've already chosen the best response.0
like that?
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.2
you forgot the final chain rule
 one year ago

primeralph Group TitleBest ResponseYou've already chosen the best response.2
dw:1371609898205:dw
 one year ago

burhan101 Group TitleBest ResponseYou've already chosen the best response.0
@bahrom7893 what do you mean?
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.2
dw:1371610057029:dw
 one year ago

primeralph Group TitleBest ResponseYou've already chosen the best response.2
dw:1371610058623:dw
 one year ago

burhan101 Group TitleBest ResponseYou've already chosen the best response.0
@bahrom7893 wait i dont get it tho, why the extra fraction :S
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.2
derivative of dw:1371610223598:dw
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.2
dw:1371610328327:dw
 one year ago

burhan101 Group TitleBest ResponseYou've already chosen the best response.0
dw:1371610801029:dw @bahrom7893
 one year ago

Abhishek619 Group TitleBest ResponseYou've already chosen the best response.0
dw:1371610749100:dw
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.2
Guys stop confusing him. Burhan, your first answer was right. You just forgot to add in that fraction.
 one year ago

burhan101 Group TitleBest ResponseYou've already chosen the best response.0
How do i simplify further ?
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.2
just use algebra, cancel out some fractions.
 one year ago

burhan101 Group TitleBest ResponseYou've already chosen the best response.0
howww im really confused !!
 one year ago

burhan101 Group TitleBest ResponseYou've already chosen the best response.0
The answer key says it should be \[\huge A'(t) = \frac{ 1 }{ 50\pi }\sin (\frac{ t }{ 50\pi })\]
 one year ago

burhan101 Group TitleBest ResponseYou've already chosen the best response.0
@bahrom7893
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.2
2Sin(x)Cos(x) = ? (double angle formula)
 one year ago

burhan101 Group TitleBest ResponseYou've already chosen the best response.0
if i just simplify that fraction to 'x' then =20((2sinx)(cosx)(x)) =20(xsinx)
 one year ago

primeralph Group TitleBest ResponseYou've already chosen the best response.2
.just use what I gave if you're still confused....
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.2
dw:1371612098284:dw
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.2
so according to our calculations, the answer should be: dw:1371612290008:dw which seemed right. the book might have a typo
 one year ago

primeralph Group TitleBest ResponseYou've already chosen the best response.2
........which is what I said 40 minutes ago........ dw:1371612421231:dw
 one year ago

burhan101 Group TitleBest ResponseYou've already chosen the best response.0
thanks both !@bahrom7893 @primeralph
 one year ago

primeralph Group TitleBest ResponseYou've already chosen the best response.2
You're very welcome.
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.2
np my friend :)
 one year ago

burhan101 Group TitleBest ResponseYou've already chosen the best response.0
b) What is the first value of t greater than 0 for which the derivative is equal to 0?
 one year ago

burhan101 Group TitleBest ResponseYou've already chosen the best response.0
@primeralph
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.2
set the derivative equal to 0, then check the signs nearby
 one year ago

burhan101 Group TitleBest ResponseYou've already chosen the best response.0
@primeralph what does that mean ^ ?
 one year ago

primeralph Group TitleBest ResponseYou've already chosen the best response.2
for it to equal zero, you have to shift t by the period pi
 one year ago

primeralph Group TitleBest ResponseYou've already chosen the best response.2
dw:1371615489438:dw
 one year ago
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