Calculated Industries 4090 - Manual (Page 11)

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Your calculator has standard trigonometric keys, in addition to Right
Triangle keys (e.g.,
R, r, d and p), for advanced Right Triangle
mathematics.
The Sine, Cosine, and Tangent of an angle are defined in relation to
the sides of a Right Triangle.
Using the Ç key with the trigonometric function gives you the
Arcsine, Arccosine and Arctangent – all of which are used to find the
Angle for the Sine, Cosine, or Tangent value entered.
S Sine Function — Calculates the Sine of a Degree
or undimensioned* value.
Ç S Arcsine (sin -1 ) — Calculates the angle for the
entered or calculated Sine value.
ç Cosine Function — Calculates the Cosine of a
Degree or undimensioned* value.
З з Arccosine (cos -1 ) — Calculates the angle for the
entered or calculated Cosine value.
t Tangent Function — Calculates the Tangent of a
Degree or undimensioned* value.
Ç t Arctangent (tan -1 ) — Calculates the angle for the
entered or calculated Tangent value.
*Note: Cannot use on dimensioned values.
PYTHAGOREAN THEOREM / RIGHT TRIANGLE KEYS