Texas Instruments TI-89 User Manual - Page 797

cot() MATH/Trig menu cot(expression1) ⇒ expression cot(list1) ⇒ list Returns the cotangent of expression1 or returns a list of the cotangents of all elements in list1. Note: The result is returned as a degree, gradian or radian angle, according to the current angle mode setting. In Degree angle mode: cot(45) ¸ 1 In Gradian angle mode: cot(50) ¸ 1 In Radian angle mode: cot({1,2.1,3}) ¸ { 1 tan(1) L.584... tan1(3)} cotL1() MATH/Trig menu cotL1(expression1) ⇒ expression In Degree angle mode: cotL1(list1) ⇒ list cotL1(1) ¸ 45 Returns the angle whose cotangent is expression1 or returns a list containing the In Gradian angle mode: inverse cotangents of each element of list1. cotL1(1) ¸ 50 Note: The result is returned as a degree, gradian or radian angle, according to the current angle In Radian angle mode: mode setting. cotL1(1) ¸ p 4 coth() MATH/Hyperbolic menu coth(expression1) ⇒ expression cot(list1) ⇒ list Returns the hyperbolic cotangent of expression1 or returns a list of the hyperbolic cotangents of all elements of list1. coth(1.2) ¸ 1.199... coth({1,3.2}) ¸ {tan1h(1) 1.003... } cothL1() MATH/Hyperbolic menu cothL1(expression1) ⇒ expression cothL1(list1) ⇒ list Returns the inverse hyperbolic cotangent of expression1 or returns a list containing the inverse hyperbolic cotangents of each element of list1. cothL1(3.5) ¸ .293... cothL1({L2,2.1,6}) ¸ { Lln(3) 2 .518... ln(27/5)} crossP( ) MATH/Matrix/Vector ops menu crossP(list1, list2) ⇒ list Returns the cross product of list1 and list2 as a list. list1 and list2 must have equal dimension, and the dimension must be either 2 or 3. crossP({a1,b1},{a2,b2}) ¸ {0 0 a1ø b2ì a2ø b1} crossP({0.1,2.2,ë 5},{1,ë.5,0}) ¸ {ë 2.5 ë 5. ë 2.25} crossP(vector1, vector2) ⇒ vector Returns a row or column vector (depending on the arguments) that is the cross product of vector1 and vector2. Both vector1 and vector2 must be row vectors, or both must be column vectors. Both vectors must have equal dimension, and the dimension must be either 2 or 3. crossP([1,2,3],[4,5,6]) ¸ [ë 3 6 ë 3] crossP([1,2],[3,4]) ¸ [0 0 ë 2] Appendix A: Functions and Instructions 797