HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 255

hp40g+.book Page 3 Friday, December 9, 2005 1:03 AM REWRI menu The menu contains functions that enable you to rewrite an expression in another form. SOLV menu TRIG menu The menu contains functions that enable you to solve equations, linear systems, and differential equations. The menu contains functions that enable you to transform trigonometric expressions. NOTE You can get online help about any CAS function by pressing 2 and selecting that function (as explained in "Online Help" on page 14-8). Configuration menus You can directly see, and change, CAS modes while working with the Equation Writer. The first line in each of the Equation Writer menus (except ) indicates the current CAS mode settings. In the example at the right, the first line of the menu reads: CFG R= X S CFG stands for "configuration", and the symbols to the right of it indicate various mode settings. • The first symbol, R, indicates that you are in real mode. If you were in complex mode, this symbol would be C. • The second symbol, =, indicates that you are in exact mode. If you were in approximate mode, this symbol would be ~. • The third symbol, X in the above example, indicates the current independent variable. Equation Writer 15-3