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The only variable on the right hand side is sin(x). The maximum value of sin(x) is 1. So, the max value of 3sin(x) is 3*1 = 3 and so, the max value of 3sin(x) + 2 is 3+2 = 5.
4.2 is a pure real (rational) number. It has no specific X value.
.75/x=.33
No, because 'x' is a variable.
The answer will depend on what x is.