- #1

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## Homework Statement

Only the second part

## Homework Equations

Second derivative:

$$\frac{d^2y}{dx^2}=\frac{d}{dx}\frac{dy}{dx}$$

## The Attempt at a Solution

$$dx=(1-2t)\,dt,~~dy=(1-3t^2)\,dt$$

Do i differentiate the differential dt?

$$d^2x=(-2)\,dt^2,~~d^2y=(-6)t\,dt^2$$

$$\frac{d^2y}{dx^2}=\frac{d^2y/dt^2}{d^2x/dt^2}=\frac{-6t}{-2}=...=3$$

The answer should be -2