Make a carefully labeled sketch for each of the following functions.
(a) Sketch cos 0 for values of 9 in the range 0 <-7 8 S 67r.

(b) Sketch cos(0.2;rt) for values oft such that three periods of the function are shown.

(c) Sketch cos (211.1/ T0) for values of t such that three periods of the function are shown. Label the horizontal axis in terms of the parameter 7'0.

(d) Sketch as (2xt/ T3 + Yr/2) for values of t such that three periods of the function are shown.