HP 40gs User Manual
Page 290
16-16
Step-by-Step Examples
DEF command to it. Press
to complete the
definition.
To calculate the real part of
the expression, apply the
IM command (available on
the
COMPLEX submenu of
the
MATH menu) to the
stored variable M.
Press
to get the
result at the right:
Finally, define the result as
Y(t) in the same way that
you defined X(t): by firstly
adding Y(t) = to the
expression (as shown at the
right) and then applying the
DEF command.
We have now found the coordinates of M in terms of t.
Part 2
To find an axis of symmetry for Γ, calculate
and
by typing:
X
t
Press
to highlight the
expression.
Then press
to
produce the result at the
right:
In other words,
Now type
Y
t
Press
to highlight the
expression.
x t
–
( )
y t
–
( )
x t
–
( ) x t
( )
=
hp40g+.book Page 16 Friday, December 9, 2005 1:03 AM