Use the following notation for the entries in the matrix A and the vector \vec b.
Use * for multiplication and ^ for exponentiation.
Trigonometric functions -- sin, cos, tan, asin, acos, atan, and others
The natural logarithm is denoted ln
The constants e and \pi are entered e and pi
The square root is denoted sqrt and the absolute value is denoted abs.
The maximum and minimum are denoted max and min.
floor, ceiling, and round are used for the greatest integer below a number, the least integer above a number, and to round a number to the nearest integer.