Trig Menu - HP 40gs User Manual

hp40g+.book Page 38 Friday, December 9, 2005 1:03 AM
SOLVEVX

TRIG menu

ACOS2S
14-38
Solve equations
SOLVEVX has as a parameter either:
(1) an equality between two expressions in the variable
contained in VX, or
(2) a single such expression (in which case = 0 is
implied).
SOLVEVX solves the equation.
Example 1
Typing:
4
SOLVEVX(X -1=3)
gives, in real mode:
(x = −√2) OR (x = √2)
or, in complex mode, even if you have chosen X as real:
(x = −√2) OR (x = √2) OR (x = −i · √2) OR (x = i√2)
Example 2
Typing:
2
SOLVEVX(2X +X)
gives, in real mode:
(x = −1/2) OR (x = 0)
The TRIG menu contains functions that enable you to
transform trigonometric expressions.
Transform the arccos into arcsin
ACOS2S has as a trigonometric expression as an
argument.
ACOS2S transforms the expression by replacing
π
− arcsin(x).
-- -
arccos(x) with
2
Computer Algebra System (CAS)