Question

What is the limit of (cos x-1)/(2x^2) as x approaches 0?

Answer 1

can u use L'Hopital's rule?

Answer 2

nope :(

Answer 3

As in you haven't covered it or as in you are not sure how to use it?

Answer 4

as in not covered yet lol

Answer 5

multiply and divide by 1+cos x

Answer 6

(cos^x-1)/(2x^2)(cosx+1) ?

Answer 7

right!
now what is 1-cos^2 x = ??

Answer 8

sin^2x thank you!

Answer 9

welcome ^_^