Mathematics

Problem

y

is a function of

x

and

x

is a function of

t

, which of the following relations is correct? a)

\displaystyle \frac{dy}{dt}=\frac{dx/dt}{dx/dy}

\displaystyle \frac{dy}{dt}=2\,\frac{dy}{dx}\,\frac{dx}{dt}

\displaystyle \frac{dy}{dt}=\frac{dy}{dx}\,\frac{dx}{dt}

\displaystyle \frac{dy}{dt}=\frac{dy/dx}{dt/dx}