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\[\frac{\Delta y}{\Delta x}= \frac{f(x+h)- f(x)}{h} \] \[\frac{\Delta y}{\Delta x} = \frac{f(x+h)- f(x)}{h}\] \[\Delta y \] \[ y = \int f(x) dx \] \[\Delta y \] \[ y = \int f(x) dx \] I got it working now, except the last one , integral doesn't like me. Now it all works. I noticed there was a message saying something like "pasted as rich text, paste as plain text instead" which I choose and then the integral also worked.