$\displaystyle \frac{d^2x}{dt^2}=x\cdot \frac{dx}{dt}$ I don't even know where to start. Can someone give me a little push? Thanks in advance.
Follow Math Help Forum on Facebook and Google+
Hint: The right-hand side is $\displaystyle \tfrac d{dt}\bigl(\tfrac12x^2\bigr)$.
View Tag Cloud