Hello, witri!

The height, centimeters, of a bicycle pedal above the ground

at time seconds is given by the equation: .

(a) Calculate the maximum and minimum heights of the pedal

(b) Find the first two positive values of t for which the height of the pedal is 43 cm.

(c) How many revolutions does the pedal make in one minute?

First, convert degrees to radians: .

Can you finish the problem now?