HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 176

hp40g+.book Page 22 Friday, December 9, 2005 1:03 AM 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. To find derivatives in the Function aplet's Symbolic view To find the derivative of the function in the Function aplet's Symbolic view, you define two functions and define the second function as a derivative of the first function. For example, to differentiate sin (x2) + 2 cosx : 1. Access the Function aplet's Symbolic view and define F1. 2 2. Define F2(X) as the derivative of F(1). 13-22 Using mathematical functions