HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 292
Part 4, Part 5
UPC - 882780045217
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hp40g+.book Page 18 Friday, December 9, 2005 1:03 AM Part 4 Part 5 16-18 To calculate y′(t) , begin by typing: DERVX(Y(t)). Pressing returns: Press again to simplify the result: Select FACTOR and press . You can now define the function y′(t) (in the same way that you defined x′(t) ). To show the variations of x(t) and y(t) , we will trace x(t) and y(t) on the same graph. The independent variable must be t which it should be as a result of the previous calculations. (You can check this by pressing .) Type X(t) in the Equation Writer and press . The corresponding expression is displayed. Now press , select Function, press , select F1 as the destination and press . Now do the same thing with Y(t), making F2 the destination. To graph the functions, quit CAS (by pressing ), choose the Function aplet, and check F1 and F2. Step-by-Step Examples