This corresponds to Problem 1.21c - f Consider the function f(t) = sin(215t). (c) For what value(s) of t is f(t) = 1? If there are more than one values, give the three values that are closest to t = 0, as a comma separated list. (d) For what value(s) of t is f(t) = 0? If there are more than one values, give the three values that are closest to t = 0, as a comma separated list. (e) (sin(210 Ft)) = (f) / sin(21Ft) = (15 points) This problem corresponds to Problem 2.27 in the text. a) The value of | 8(t)[3e-41 + 1 sin(2110°t)]dt is b) The value of S(t – 6)e-2.5tu(t)dt is J -00 c) The value of 8(t – 1)e-5' [u(t) – u(t + 4)]dt is (20 points) What is the fundamental period of the function s(t) = cos(215000t) + cos(2119000t) in seconds (if t is measures in seconds)?