HP 39gII User Manual page 167

S
ATAN
j
S
k
S
n
Using mathematical functions
–1
Arc tangent: tan
–π/2 to π/2. Inputs and outputs depend on the current
angle format. Also accepts complex numbers.
ATAN(value)
Example:
ATAN(1) returns 45 (Degrees mode).
Square. Also accepts complex numbers.
2
value
Example:
returns 324
2
18
Square root. Also accepts complex numbers.
value or
Example:
returns 18
324
Power (x raised to y). Also accepts complex numbers.
value^power
Example:
2^8 returns 256
Nth root ( ). Takes the nth root of x.
n
x
root NTHROOT value
Example:
3 NTHROOT 8 returns 2
x. Output range is from –90° to 90° or
(expression)
157