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Find (d^2y)/(dx^2) if x = at^2 , y=2 "at...

Find `(d^2y)/(dx^2)` if `x = at^2 , y=2 "at", t ne 0`

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The correct Answer is:
`(dy)/(dx) = (y ' (t) )/( x' (t)) = (2a )/( 2 at ) = (1)/( t).`
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