Texas Instruments TI89TITANIUM User Manual - Page 796

cosê () ¥ R key cosê (expression1) ⇒ expression cosê (list1) ⇒ list cosê (expression1) returns the angle whose cosine is expression1 as an expression. cosê (list1) returns a list of the inverse cosines of each element of list1. Note: The result is returned as a degree, gradian or radian angle, according to the current angle mode setting. In Degree angle mode: cosê (1) ¸ 0 In Gradian angle mode: cosê (0) ¸ 100 In Radian angle mode: cosê ({0,.2,.5}) ¸ {p2 1.369... 1.047...} cosê(squareMatrix1) ⇒ squareMatrix Returns the matrix inverse cosine of squareMatrix1. This is not the same as calculating the inverse cosine of each element. For information about the calculation method, refer to cos(). squareMatrix1 must be diagonalizable. The result always contains floating-point numbers. In Radian angle mode and Rectangular complex format mode: cosê([1,5,3;4,2,1;6,ë2,1]) ¸ ë1..773245......++.10.6541...5ø...iøi ë 1.490...+2.105...øi .623...+.778...øi ... ...   ë 2.083...+2.632...øi 1.790...ì 1.271...øi ... cosh( ) MATH/Hyperbolic menu cosh(expression1) ⇒ expression cosh(list1) ⇒ list cosh (expression1) returns the hyperbolic cosine of the argument as an expression. cosh(1.2) ¸ cosh({0,1.2}) ¸ 1.810... {1 1.810...} cosh (list1) returns a list of the hyperbolic cosines of each element of list1. cosh(squareMatrix1) ⇒ squareMatrix In Radian angle mode: Returns the matrix hyperbolic cosine of squareMatrix1. This is not the same as calculating the hyperbolic cosine of each element. For information about the calculation method, refer to cos(). squareMatrix1 must be diagonalizable. The result always contains floating-point numbers. cosh([1,5,3;4,2,1;6,ë2,1]) ¸ 432217..265355 253.909 255.301 221062..990558 226.297 216.623 167.628 coshê ( ) MATH/Hyperbolic menu coshê (expression1) ⇒ expression coshê (list1) ⇒ list coshê (expression1) returns the inverse hyperbolic cosine of the argument as an expression. coshê (1) ¸ coshê ({1,2.1,3}) ¸ {0 1.372... 0 coshê (3)} coshê (list1) returns a list of the inverse hyperbolic cosines of each element of list1. coshê(squareMatrix1) ⇒ squareMatrix Returns the matrix inverse hyperbolic cosine of squareMatrix1. This is not the same as calculating the inverse hyperbolic cosine of each element. For information about the calculation method, refer to cos(). squareMatrix1 must be diagonalizable. The result always contains floating-point numbers. In Radian angle mode and Rectangular complex format mode: coshê([1,5,3;4,2,1;6,ë2,1]) ¸ .24.8562...5ì...+.17.2753...4ø...iøi ë.009...ì 1.490...øi 1.662...+.623...øi ... ...   ë.322...ì 2.083...øi 1.267...+1.790...øi ...  796 Appendix A: Functions and Instructions