Application Guide

cos()
µ key
When a scalar function f(A) operates on
squareMatrix1 (A), the result is calculated
by the algorithm:
Compute the eigenvalues (λ
i
) and
eigenvectors (V
i
) of A.
squareMatrix1 must be diagonalizable.
Also, it cannot have symbolic variables that
have not been assigned a value.
Form the matrices:
Then A = X B X⁻¹ and f(A) = X f(B) X⁻¹. For
example, cos(A) = X cos(B) X⁻¹ where:
cos(B) =
All computations are performed using
floating-point arithmetic.
cos⁻¹()
µ key
cos⁻¹(Expr1) ⇒ expression
cos⁻¹(List1) ⇒ list
cos⁻¹(Expr1) returns the angle whose
cosine is Expr1 as an expression.
cos⁻¹(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.
Note: You can insert this function from the
keyboard by typing arccos(...).
In Degree angle mode:
In Gradian angle mode:
In Radian angle mode:
Alphabetical Listing 31