Inverse Trigonometric Functions

Trigonometry TRIGONOMETRIC FUNCTIONS There are two notations commonly used to indicate an inverse trigonometric function. arcsin 0.35837 21° sin¹ 0.35837 21° The notation arcsin means the angle whose sine is. The notation arc can be used as a prefix to any 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 an indication of the inverse trigonometric function. To perform this function on a calculator, enter the numerical value, press the INV key, then the SIN, COS, or TAN key. To calculate the inverse function of cot, csc, and sec, the reciprocal key must be pressed first then the SIN, COS, or TAN key. Examples: Evaluate the following inverse trigonometric functions. arcsin 0.3746 22° arccos 0.3746 69° arctan 0.3839 21° arccot 2.1445 arctan 1 2.1445 arctan 0.4663 25° arcsec 2.6695 arccos 1 2.6695 arccos 0.3746 68° arccsc 2.7904 arcsin 1 2.7904 arcsin 0.3584 21° Rev. 0 Page 7 MA-04