Quick derivative question?

I dont understand what d^2y/dx^2 means. I thought it was just the derivitive of the derivitive but this is wrong.

x = 6t + ln(t)
y= 3t-ln(t)

Question

Quick derivative question?

I dont understand what d^2y/dx^2 means. I thought it was just the derivitive of the derivitive but this is wrong.

x = 6t + ln(t)
y= 3t-ln(t)

anonymous · Answer

the x and y is what i need to get help with.

e.mccormick · Answer

Typically, $$f''(x)=(f'(x))'=y''=\frac{d^2y}{dx^2}=\frac{d}{dx} ( \frac{dy}{dx} ) $$

anonymous · Answer

thanks! i cant believe i didnt understand that..

e.mccormick · Answer

Now, what you put in below the derivative part was something with a t, so this may be something completely different.

e.mccormick · Answer

And yah, the derivative of the derivative is one way to say second derivative.