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help with rates of change (1 Viewer)

mac1996

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Hey guys
How would you do the questions attached?

Screen Shot 2013-03-08 at 11.19.22 PM.png

thank you
 

RishBonjour

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asdasd.jpg

Didn't have a look at the rest but couldn't be that much different.
 
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Since I'm lazy I will just do Q3 part 1. The method of doing these is as exactly described by RishBonjour.

Remember that the all sides are equal and that the angle is 60 deg.


now dx/dt=dx/DA * DA/dt.
DA/dt=2 (given)
 

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