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Question

Find the slope of the tangent to the curve x=at2, y=2at at t=1

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Solution

Consider the following equation.

x=at2, y=2atatt=1

Differentiate both side w.r.t x and y we get.

dxdt=2at.....(1)

dydt=2a..........(2)

Divide eq.(1)in eq. (2) we get.

dydx=2at2a......(3)

dydx=t

Put the value of t in eq. (3) we get.

dydx=1

dy=dx

Hence, this is the correct answer


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