HP 40g hp 39g & 40g_user's manual_English_E_pdfbpia5212.pdf - Page 159
Finding derivatives
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Finding derivatives The HP 39G/40G can perform symbolic differentiation on some functions. There are two ways of using the HP 39G/40G to find derivatives. • You can perform differentiations in HOME by using the formal variables, S1 to S5. • You can perform differentiations of functions of X in the Function aplet. To find derivatives in HOME To find the derivative of the function in HOME, use a formal variable in place of X. If you use X, the differentiation function substitutes the value that X holds, and returns a numeric result. For example, consider the function: dx( sin (x 2 ) + 2 cos (x) ) 1. Enter the differentiation function onto the command line, substituting S1 in place of X. S1 S1 2 S1 2. Evaluate the function. 3. Show the result. HP 39G HP 40G Using mathematical functions 10-23