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Find dydx, if x = 2at2, y = at4.

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Question

Find `(dy)/(dx)`, if x = 2at2, y = at4.

Sum
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Solution

x = 2at2 

Differentiating both sides w.r.t. t, we get

`(dx)/(dt)` = 4at

y = at4

Differentiating both sides w.r.t. t, we get

`(dy)/(dt) = 4at^3`

∴ `(dy)/(dx) = (((dy)/(dt)))/(((dx)/(dt))) = (4at^3)/(4at) = t^2`

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Chapter 3: Differentiation - EXERCISE 3.5 [Page 97]

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