Business. Computer sales are generally subject to seasonal fluctuations. An analysis of the sales of a computer manufacturer during 2015-2017 is approximated by the function s (t) = 0.082 cos, + 0.393 1 < t < 12
where t represents time in quarters (t = 1 represents the end of the first quarter of 2015), and s (t) represents computer sales (quarterly revenue) in millions of dollars. Use a double-angle identity to express s (t) in terms of the cosine function
Enclose arguments of functions in parentheses. For example, sin (2x)
s(t) =