По графику, изображенному на рисунке, определите

According to the graph shown in the figure, determine the amplitude of the current strength, period and frequency. Write the equation of the instantaneous value of the current.

Problem 31656. A detailed solution with a brief description of the condition, formulas and laws used in the solution, the derivation of the formula and the answer.
If you have any questions about the solution, please write. I try to help.