Question

Hi , can someone help me with a question in this PDf file ?? its Question 6 on page 14

Answer 1

Have you considered expanding \(\cos(x+h)\)?

Is it legal to help you on this?

Answer 2

yea it is dont worry, its a practice assignment and yea could u give me the first dew steps ??

Answer 3

There is only one. \(\cos(x+h) = \cos(x)\cos(h) - \sin(x)\sin(h)\). This is an identity you should memorize and have at the ready!

Answer 4

would i take the derative of the -cosx?

Answer 5

Why would you do that? Do we have l'hospital's rule? Is it an Indeterminate Form?