HP (Hewlett-Packard) 50g ユーザーズマニュアル

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This is the general format for the definite integral when typed directly into the 
stack, i.e., 
∫ (lower limit, upper limit, integrand, variable of integration)
Pressing ` at this point will evaluate the integral in the stack:
The integral can be evaluated also in the Equation Writer by selecting the entire 
expression an using the soft menu key 
@EVAL.
Step-by-step evaluation of derivatives and integrals
With the Step/Step option in the CAS MODES windows selected (see Chapter 
1), the evaluation of derivatives and integrals will be shown step by step.  For 
example, here is the evaluation of a derivative in the Equation Writer:
     
ʳʳʳʳʳ
Notice the application of the chain rule in the first step, leaving the derivative of 
the function under the integral explicitly in the numerator. In the second step, the 
resulting fraction is rationalized (eliminating the square root from the 
denominator), and simplified.  The final version is shown in the third step.  Each 
step is shown by pressing the 
@EVAL menu key, until reaching the point where 
further application of function EVAL produce no more changes in the 
expression.