✔ 最佳答案
For sin(3x), its maximum value is 1
So, the maximum point of y = (2/3) sin(3x) is y = 2/3
For the corresponding x value, 3x = npi +- pi/2
x = npi/3 +- pi/6, where n is an integer
So, the maximum points is (npi/3 +- pi/6 , 2/3)
where n is an integer