HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 290

hp40g+.book Page 16 Friday, December 9, 2005 1:03 AM Part 2 16-16 DEF command to it. Press 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: to complete the 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. To find an axis of symmetry for Γ, calculate x(-t) and y(-t) by typing: X t Press to highlight the expression. Then press to produce the result at the right: In other words, x(-t) = x(t) Now type Y t Press to highlight the expression. Step-by-Step Examples