HP 39gII User Manual page 166

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ASIN
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ACOS
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Common logarithm. Also accepts complex numbers.
LOG(value)
Example:
LOG(100) returns 2
Common exponential (antilogarithm). Also accepts
complex numbers.
10^value
Example:
10^3 returns 1000
Sine, cosine, tangent. Inputs and outputs depend on the
current angle format (Degrees, Radians, or Grads).
SIN(value)
COS(value)
TAN(value)
Example:
TAN(45) returns 1 (Degrees mode).
–1
Arc sine: sin x. Output range is from –90° to 90° or –π/
2 to π/2. Inputs and outputs depend on the current angle
format. Also accepts complex numbers.
ASIN(value)
Example:
ASIN(1) returns 90 (Degrees mode).
–1
Arc cosine: cos x. Output range is from 0° to 180° or 0
to π. Inputs and outputs depend on the current angle
format. Also accepts complex numbers. Output will be
complex for values outside the normal cosine domain of
.
≤ ≤
1 – x 1
ACOS(value)
Example:
ACOS(1) returns 0 (Degrees mode).
Using mathematical functions