Recent content by BoT

1. ex*eh+e-x*e-h -ex -e-x/ 2h 2. This should simplify to (e^x-e^-x)/2. This is lim (h--->0) so in the end the h should become 0 (I think!) 3. I have absolutely no idea what to do!

I got it to ex*eh+e-x*e-h -ex -e-x/ 2h But how do I simplify this? This is the part that always screws me up!

1. Differentiate cosh(x) using first principles 2. cosh(x) = (e^x+e^-x)/2 From previous exercises, I know the answer will be sinh(x)= (e^x-e^-x)/2 but I cannot get to the answer. I seem to be left with the equation: lim h ---> 0 (e^2x*e^2h +1-e^h*2e^x +e^h)/(2h*e^x*e^h) But when...