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Section 3: Functions 36
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Using this rule and common sense. you may have already calculated several functions effectively. Missing from
the presentation thus far, has been a systematic review of just which functions are available, and the respective
conditions that apply to them individually. To meet this need, all essentials are included in Figures
3-1, 3-2, and 3-3.
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To calculate a given function, the respective table entry shows any conditions that apply to the input value(s),
the keys to use, and conditions applying to the result(s). If your need Is to start calculation immediately,
you might even end your study of functions with the tables. skipping the sample cases.
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Functions Involving Angles
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These functions are listed in Figure 3-1. They include the trigonometric functions (sine, cosine,
tangent and their inverses), the rectangular-polar conversions, the addition and subtraction of angles
expressed in degrees, minutes, seconds, and conversions of angles expressed decimally to/from degrees, minutes,
and seconds.
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Angular Mode
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Operations involving angles assume the angles to be expressed in units of the prevailing angular mode,
which is set to decimal degrees whenever the calculator is switched on. You can set the mode to radians
or grads or decimal degrees by using the mode functions.
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Angular Mode Functions
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Keys
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Function
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Set mode to grads
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Set mode to radians
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Set mode to degrees
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400 grads = 360 degrees = 2 π radians
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Keys to which Angular Mode applies:
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SINCOSTANR P D.MS
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In the examples, the degree mode is assumed except as noted otherwise.
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