Rewrite the expression as an equivalent expression that does not contain powers of trigonometric functions greater than 1. cos^3 x a. 3/4 cos x − 1/4 cos 3x − cos 2x b. 3/4 cos x − 1/4 cos 3x c. 3/4 cos x + 1/4 cos 3x + cos 2x d. 3/4 cos x + 1/4 cos 3x

What is the sum of the geometric series in which a1 = 7, r = 3, and an = 1,701? hint: cap s sub n equals start fraction a sub one left parenthesis one minus r to the power of n end power right parenthesis over one minus r end fraction comma r ≠ 1, where a1 is the first term and r is the common ratio