Texas Instruments voyage 200 User Manual - Page 886
tCollect, tExpand, timeCnv, Degree-mode scaling
UPC - 033317193424
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tCollect() MATH\Algebra\Trig menu tCollect(expression1) ⇒ expression Returns an expression in which products and integer powers of sines and cosines are converted to a linear combination of sines and cosines of multiple angles, angle sums, and angle differences. The transformation converts trigonometric polynomials into a linear combination of their harmonics. tCollect((cos(a))^2) ¸ cos(2ø a) + 1 2 tCollect(sin(a)cos(b)) ¸ sin(aì b)+sin(a+b) 2 Sometimes tCollect() will accomplish your goals when the default trigonometric simplification does not. tCollect() tends to reverse transformations done by tExpand(). Sometimes applying tExpand() to a result from tCollect(), or vice versa, in two separate steps simplifies an expression. tExpand() MATH\Algebra\Trig menu tExpand(expression1) ⇒ expression Returns an expression in which sines and cosines of integer-multiple angles, angle sums, and angle differences are expanded. Because of the identity (sin(x))2+(cos(x))2=1, there are many possible equivalent results. Consequently, a result might differ from a result shown in other publications. tExpand(sin(3f)) ¸ 4ø sin(f)ø (cos(f))ñ ì sin(f) tExpand(cos(aì b)) ¸ cos(a)ø cos(b)+sin(a)ø sin(b) Sometimes tExpand() will accomplish your goals when the default trigonometric simplification does not. tExpand() tends to reverse transformations done by tCollect(). Sometimes applying tCollect() to a result from tExpand(), or vice versa, in two separate steps simplifies an expression. Note: Degree-mode scaling by p/180 interferes with the ability of tExpand() to recognize expandable forms. For best results, tExpand() should be used in Radian mode. Text CATALOG Text promptString Text "Have a nice day." ¸ Displays the character string promptString dialog Done box. If used as part of a Dialog...EndDlog block, promptString is displayed inside that dialog box. If used as a standalone instruction, Text creates a dialog box to display the string. Then See If, page 828. timeCnv() CATALOG timeCnv(seconds) ⇒ list Converts seconds to units of time that can be more easily understood for evaluation. The list is in {days,hours,minutes,seconds} format. Note: See also checkTmr() and startTmr(). timeCnv(152442117) {1764 9 1 57} 888 Appendix A: Functions and Instructions