## Elementary Functions

### abs(x)

The abs function returns the absolute value of the real number num. To calculate the absolute value of a complex number, use cabs.

### acos(x)

The acos function returns the inverse cosine of num in radians. In complex expressions, num is complex, and acos returns a complex value.

### acosh(x)

The acosh function returns the inverse hyperbolic cosine of num. In complex expressions, num is complex, and acosh returns a complex value.

### alog(x)

The alog function returns 10^num.

### asin(x)

The asin function returns the inverse sine of num in radians. In complex expressions, num is complex, and asin returns a complex value.

### asinh(x)

The asinh function returns the inverse hyperbolic sine of num. In complex expressions, num is complex, and asinh returns a complex value.

### atan(x)

The atan function returns the inverse tangent of num in radians. In complex expressions, num is complex, and atan returns a complex value. Results are in the range -p/2 to p/2.

### atan2(y1,x1)

The atan2 function returns the angle in radians whose tangent is y1 Öx1. Results are in the range -p to p.

### atanh(x)

The atanh function returns the inverse hyperbolic tangent of num. In complex expressions, num is complex, and atanh returns a complex value.

### cos(x)

The cos function returns the cosine of angle which is in radians. In complex expressions, num is complex, and cos(num) returns a complex value.

### cosh(x)

The cosh function returns the hyperbolic cosine of num. In complex expressions, num is complex, and cosh(num) returns a complex value.

### exp(x)

The exp function returns e^num. In complex expressions, num is complex, and exp(num) returns a complex value.

### ln(x)

The ln function returns the natural logarithm of num, -INF if num is 0, or NaN if num is less than 0. In complex expressions, num is complex, and ln(num) returns a complex value.

### log(x)

The log function returns the log base 10 of num. It returns -INF if num is 0, and returns NaN if num is less than 0.

### sign(x)

The sign function returns -1 if num is negative or 1 if it is not negative.

### sin(x)

The sin function returns the sine of angle which is in radians. In complex expressions, angle is complex, and sin(angle) returns a complex value.

### sinh(x)

The sinh function returns the hyperbolic sine of num. In complex expressions, num is complex, and sinh(num) returns a complex value.

### sinc(x)

The sinc function returns sin(num)/num. The sinc function returns 1.0 when num is zero. num must be real.

### sqrt(x)

The sqrt function returns the square root of num or NaN if num is negative. In complex expressions, num is complex, and sqrt(num) returns a complex value.

### tan(x)

The tan function returns the tangent of angle which is in radians. In complex expressions, num is complex, and tan(num) returns a complex value.

### tanh(x)

The tanh function returns the hyperbolic tangent of num. In complex expressions, num is complex, and tanh(num) returns a complex value.