Texas Instruments TI-73VSC Guidebook - Page 216
The [2nd] [TRIG] TRIG Menu, Trig Functions
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210 Chapter 11: Trigonometry The - u TRIG Menu The - u TRIG (trigonometry) menu accesses the trigonometric (trig) functions (sin(, cos(, tan() and their inverses (sin-1(, cos-1(, tan-1(). -u The sine, cosine, and tangent of an angle (q) are defined by the lengths of the sides of a right triangle. sin q = opposite hypotenuse cos q = adjacent hypotenuse tan q = opposite adjacent hypotenuse q adjacent opposite Trig Functions - u 1, 3, and 5 All trig functions return the sine, cosine, or tangent of a real number, expression, or a each element in a list. If value is a list, the calculator calculates the trig function of each element in the list, and a list is returned. sin(value) cos(value) tan(value) For tan, value cannot be 90, 270, etc., or M90, M270, etc. In other words, since tan q=sinàcos by definition, tan q is undefined when cos q=0.