HP HP-20S - Trigonometric Modes and Functions

Keys Description Annunciator
(~] Sets Degrees mode. There are 360 degrees None
in a circle. Angles are measured in decimal
degrees (rather than degrees-minutes-
seconds).
s Sets Radians mode. There are 2x radians in RAD
a circle.
(] (GRD] Sets Grads mode. There are 400 grads in a GRAD
circle.
To exit RAD or GRAD mode press [¢>] [DEG].
Trigonometric Functions
Angles are interpreted in decimal degrees, radians, or
grads depending on the current trigonometric mode.
Keys Function Keys Function
SIN sine (-] arc sine
coS cosine (=) arc cosine
TAN tangent (+) arc tangent
Keys: Display: Description:
] Sets Degrees mode.
15 0.2588 Sine of 15°.
1 60 1.7321 Tangent of 60°.
(=) 2.7321 Calculates
1 + tan 60°.
3: Numeric Functions
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