HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 291
Part 3
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hp40g+.book Page 17 Friday, December 9, 2005 1:03 AM Part 3 Then press to produce the result at the right: In other words, y(-t) = -y(t) . If M1(x(t),y(t)) is part of Γ , then Mx(x(-t),y(-t)) is also part of Γ . Since M1and M2 are symmetrical with respect to the xaxis, we can deduce that the x-axis is an axis of symmetry for Γ . Calculate x′(t) by typing: DERVX X t. Press to highlight the expression. Pressing returns the result at the right: Press result: to simplify the You can now define the function x′(t) by invoking DEF. Note: You will first need to type =X1(t) then exchange X1(t) with the previous expression. To do this, highlight X1(t) and type . Now select the entire expression and apply the DEF command to it: Finally press to finish the definition. Step-by-Step Examples 16-17