In Exercises 1-2, for the simple harmonic motion described by the trigonometric function, find (a) the maximum displacement, (b)the frequency, (c)the value of d when t = 5, and (d) the least positive value of t for which d = 0. Use a graphing utility to verify your results.
1. d = 9 cos 6π / 5 t
2. d = 1 / 2 cos 20 πt
3. d = 1 / 4 sin 6πt
4. d = 1 / 64 sin 792πt