Acceleration due to gravity, "g", is considered to be

. However, changes in latitude alter "g" according to the following model:

.

a) Rewrite "g" in terms of power

only.

**I know some of the trigonometric identities but I keep getting stuck on rewriting it in terms or ** **. Help?**
b) Find the latitude of Denver, Colorado and determite "g".

**I'll be able to do this once I finish part (a).**
(c) Find the percent change between the value calculated in part (b) above and the standard value of 9.8.

**I'll be able to do this once I finish part (a) and (b).**