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PROCEDURE arctan(x: REAL) : REAL; PROCEDURE exp(x: REAL) : REAL; PROCEDURE ln(x: REAL) : REAL; PROCEDURE sin(x: REAL) : REAL; PROCEDURE cos(x: REAL) : REAL; PROCEDURE sqrt(x: REAL) : REAL;
Exp returns the exponential function of x.
Ln returns the natural logarithm of x.
Sin and cos return trigonometric functions of radian arguments.
Sqrt returns the square root of x.
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