Texas Instruments TITANIUM TI-89 - Manual (Page 887)

Appendix A: Functions and Instructions 887
tan( squareMatrix1 )
⇒ ⇒ ⇒ ⇒ squareMatrix
Returns the matrix tangent of squareMatrix1 . This
is not the same as calculating the tangent 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:
tan([1,5,3;4,2,1;6,л2,1]) ¸





 л 28.291… 26.088… 11.114…
12.117… л 7.835… л 5.481…
36.818… л 32.806… л 10.459…
tan ê ()
¥ S key
tan ê ( expression1 ) ⇒ ⇒ ⇒ ⇒ expression
tan ê ( list1 )
⇒ ⇒ ⇒ ⇒ list
tan ê ( expression1 ) returns the angle whose
tangent is expression1 as an expression.
tan ê ( list1 ) returns a list of the inverse tangents
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:
tanê (1) ¸ 45
In Gradian angle mode:
tanê (1) ¸ 50
In Radian angle mode:
tanê ({0,.2,.5}) ¸
{0 .197 ... .463 ... }
tan ê( squareMatrix1 )
⇒ ⇒ ⇒ ⇒ squareMatrix
Returns the matrix inverse tangent of
squareMatrix1 . This is not the same as calculating
the inverse tangent 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:
tanê([1,5,3;4,2,1;6,л2,1]) ¸





 л .083… 1.266… .622…
.748… .630… л.070…
1.686… л 1.182… .455…
tanh() MATH/Hyperbolic menu
tanh( expression1 )
⇒ ⇒ ⇒ ⇒ expression
tanh( list1 )
⇒ ⇒ ⇒ ⇒ list
tanh( expression1 ) returns the hyperbolic tangent
of the argument as an expression.
tanh( list ) returns a list of the hyperbolic tangents
of each element of list1 .
tanh(1.2) ¸ .833 ...
tanh({0,1}) ¸ {0 tanh(1)}
tanh( squareMatrix1 ) ⇒ ⇒ ⇒ ⇒ squareMatrix
Returns the matrix hyperbolic tangent of
squareMatrix1 . This is not the same as calculating
the hyperbolic tangent 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:
tanh([1,5,3;4,2,1;6,л2,1]) ¸





 л .097… .933… .425…
.488… .538… л.129…
1.282… л 1.034… .428…