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# Differentiation C3 finding dy/dt Watch

1. Hi
Assuming my answers to the first bit are right:

dx/dt = 2(4t+9)^-0.5

dy/dx = 3e^1/2x +1

How would I hence find the value of dy/dt when t=4?
2. Oh no wait >.< I know how to do it, I don't know how to delete this thread though. Arrggghh
3. (Original post by kej817)
Hi
Assuming my answers to the first bit are right:

dx/dt = 2(4t+9)^-0.5

dy/dx = 3e^1/2x +1

How would I hence find the value of dy/dt when t=4?
By the chain rule, .

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