Symbolic calculations in the Function aplet
You can perform symbolic operations in the Function aplet’s Symbolic view. For example, to find the derivative of a function in the Function aplet’s Symbolic view, you define two functions and define the second function as a derivative of the first function. You then evaluate the second function. See “To find derivatives in the Function aplet’s Symbolic view” on page
The hp 39g+ can perform symbolic differentiation on some functions. There are two ways of using the hp 39g+ 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(x2 ) + 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.
Using mathematical functions |