HP 39G

Using mathematical functions 10-5
>6+,)7@ASIN Arc sine: sin
–1
x. Output range is from –90° to 90°, –π/2 to
π/2, or –100 to 100 grads. Inputs and outputs depend on the
current angle format. Also accepts complex numbers.
ASIN(value)
Example
ASIN(1) returns 90 (Degrees mode).
>6+,)7@
ACOS Arc cosine: cos
–1
x. Output range is from 0° to 180°, 0 to π, or
0 to 200 grads. Inputs and outputs depend on the current angle
format. Also accepts complex numbers. Output will be
complex for values outside the normal COS domain of
.
ACOS(value)
Example
ACOS(1) returns 0 (Degrees mode).
>6+,)7@
ATAN Arc tangent: tan
–1
x. Output range is from –90° to 90°, 2π/2 to
π/2, or –100 to 100 grads. 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.
value
2
Example
18
2
returns 324
>6+,)7@√ Square root. Also accepts complex numbers.
√value
Example
returns 18
>@ Negation. Also accepts complex numbers.
–value
Example
-(1,2) returns (-1,-2)
1– x 1≤≤
324