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# CBSE Class 12-science Answered

Find dy/dx, x=e^t, y=5t^2.e^t, at t=-1
Asked by | 12 Aug, 2012, 12:11: AM Expert Answer
We have:
dx/dt = et
dy/dt = (5t2) (et) + (10t) (et) = (et) (5t2 + 10t)

Therefore,
dy/dx = (dy/dt) / (dx/dt)
= (et) (5t2 + 10t) / et
= 5t2 + 10t
At t = -1,
dy/dx = 5 - 10 = -5
Answered by | 12 Aug, 2012, 08:44: AM

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