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burhan101Best ResponseYou've already chosen the best response.0
\[\huge A(t)= 20\sin^2(\frac{ t }{ 1000\pi })\]
 10 months ago

bahrom7893Best ResponseYou've already chosen the best response.2
Use power + chain rules
 10 months ago

bahrom7893Best ResponseYou've already chosen the best response.2
This is a very straightforward question.
 10 months ago

burhan101Best ResponseYou've already chosen the best response.0
dw:1371609626141:dw
 10 months ago

bahrom7893Best ResponseYou've already chosen the best response.2
you forgot the final chain rule
 10 months ago

primeralphBest ResponseYou've already chosen the best response.2
dw:1371609898205:dw
 10 months ago

burhan101Best ResponseYou've already chosen the best response.0
@bahrom7893 what do you mean?
 10 months ago

bahrom7893Best ResponseYou've already chosen the best response.2
dw:1371610057029:dw
 10 months ago

primeralphBest ResponseYou've already chosen the best response.2
dw:1371610058623:dw
 10 months ago

burhan101Best ResponseYou've already chosen the best response.0
@bahrom7893 wait i dont get it tho, why the extra fraction :S
 10 months ago

bahrom7893Best ResponseYou've already chosen the best response.2
derivative of dw:1371610223598:dw
 10 months ago

bahrom7893Best ResponseYou've already chosen the best response.2
dw:1371610328327:dw
 10 months ago

burhan101Best ResponseYou've already chosen the best response.0
dw:1371610801029:dw @bahrom7893
 10 months ago

Abhishek619Best ResponseYou've already chosen the best response.0
dw:1371610749100:dw
 10 months ago

bahrom7893Best 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.
 10 months ago

burhan101Best ResponseYou've already chosen the best response.0
How do i simplify further ?
 10 months ago

bahrom7893Best ResponseYou've already chosen the best response.2
just use algebra, cancel out some fractions.
 10 months ago

burhan101Best ResponseYou've already chosen the best response.0
howww im really confused !!
 10 months ago

burhan101Best ResponseYou've already chosen the best response.0
The answer key says it should be \[\huge A'(t) = \frac{ 1 }{ 50\pi }\sin (\frac{ t }{ 50\pi })\]
 10 months ago

bahrom7893Best ResponseYou've already chosen the best response.2
2Sin(x)Cos(x) = ? (double angle formula)
 10 months ago

burhan101Best ResponseYou've already chosen the best response.0
if i just simplify that fraction to 'x' then =20((2sinx)(cosx)(x)) =20(xsinx)
 10 months ago

primeralphBest ResponseYou've already chosen the best response.2
.just use what I gave if you're still confused....
 10 months ago

bahrom7893Best ResponseYou've already chosen the best response.2
dw:1371612098284:dw
 10 months ago

bahrom7893Best 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
 10 months ago

primeralphBest ResponseYou've already chosen the best response.2
........which is what I said 40 minutes ago........ dw:1371612421231:dw
 10 months ago

burhan101Best ResponseYou've already chosen the best response.0
thanks both !@bahrom7893 @primeralph
 10 months ago

primeralphBest ResponseYou've already chosen the best response.2
You're very welcome.
 10 months ago

burhan101Best 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?
 10 months ago

bahrom7893Best ResponseYou've already chosen the best response.2
set the derivative equal to 0, then check the signs nearby
 10 months ago

burhan101Best ResponseYou've already chosen the best response.0
@primeralph what does that mean ^ ?
 10 months ago

primeralphBest ResponseYou've already chosen the best response.2
for it to equal zero, you have to shift t by the period pi
 10 months ago

primeralphBest ResponseYou've already chosen the best response.2
dw:1371615489438:dw
 10 months ago
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