What is the value of X, y = 1-2 / 3 SiNx take the maximum and minimum values? What are the maximum and minimum values

When the function y = 1-2 / 3 SiNx is the maximum, SiNx must be the minimum, that is, SiNx = 0, then x = 0180 or 360
Maximum = 1-0 = 1
When the function y = 1-2 / 3 SiNx is the minimum, SiNx must be the maximum, that is, SiNx = 1, then x = 90
Minimum = 1-2 / 3 = 1 / 3

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