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**Norm** Defines a variable.

Evaluate an expression and assigns its value to a variable

The assignment statements and equations are typical of a program that is computing some complicated value. Some equations are simpler. For example to find the time it takes to travel 5 miles at 2 miles per hour you would use the equation: 5(miles)/2(miles per hr).

You need to know trigonometry and perhaps some other mathematics to understand what the equations are doing.

This is NOT a java programming problem. Try asking a mathematician. Or the author of the program.