Trigonometry TRIGONOMETRIC FUNCTIONSThere are two notations commonly used to indicate an inverse trigonometric function.arcsin 0.3583721°sin1 0.3583721°The notation arcsin means the angle whose sine is. The notation arc can be used as a prefix toany of the trigonometric functions. Similarly, the notation sin-1 means the angle whose sine is.It is important to remember that the -1 in this notation is not a negative exponent but merely anindication of the inverse trigonometric function.To perform this function on a calculator, enter the numerical value, press the INV key, then theSIN, COS, or TAN key. To calculate the inverse function of cot, csc, and sec, the reciprocal keymust be pressed first then the SIN, COS, or TAN key.Examples:Evaluate the following inverse trigonometric functions.arcsin 0.374622°arccos 0.374669°arctan 0.383921°arccot 2.1445arctan12.1445arctan 0.466325°arcsec 2.6695arccos12.6695arccos 0.374668°arccsc 2.7904arcsin12.7904arcsin 0.358421°Rev. 0 Page 7 MA-04
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