Question

find the limit as x approaches 0 for (cos2x-cosx)/x^2

Answer 1

are you familiar with L'Hopital's Rule? Take the derivative of the top divided by the derivative of the bottom. Do this until you get rid of the x in the denominator

Answer 2

yikes. this was in a very early assignment in which we had not learned that yet. i can go do it using that though. thank you