2-28Integration Calculation Precautions• In the function f(x), only X can be used as a variable in expressions. Other variables (Athrough Z excluding X, r, Ƨ) are treated as constants, and the value currently assigned tothat variable is applied during the calculation.• Input of “tol” and closing parenthesis can be omitted. If you omit “tol,” the calculatorautomatically uses a default value of 1 E–5.• Integration calculations can take a long time to complete.• You cannot use a differential, quadratic differential, integration, 3, maximum/minimum value,Solve, RndFix or log ab calculation expression inside of an integration calculation term.• In the Math input/output mode, the tolerance value is fixed at 1 E–5 and cannot be changed.I 3 Calculations [OPTN]-[CALC]-[3(]To perform 3 calculations, first display the function analysis menu, and then input the valuesusing the syntax below.*(CALC)* (E)(3( ) ak kA B n * fx-7400GII: (CALC)(n: distance between partitions)Example To calculate the following:Use n = 1 as the distance between partitions.*(CALC)*(E)(3( )? (K)V B? (K) D? (K) A E @U* fx-7400GII: (CALC)3 Calculation Precautions• The value of the specified variable changes during a 3 calculation. Be sure to keep separatewritten records of the specified variable values you might need later before you perform thecalculation.• You can use only one variable in the function for input sequence ak.• Input integers only for the initial term (A) of sequence ak and last term (B) of sequence ak.• Input of n and the closing parentheses can be omitted. If you omit n, the calculatorautomatically uses n = 1.• Make sure that the value used as the final termB is greater than the value used as the initialtermA. Otherwise, an error will occur.• To interrupt an ongoing 3 calculation (indicated when the cursor is not on the display), pressthe key.• You cannot use a differential, quadratic differential, integration, 3, maximum/minimum value,Solve, RndFix or logab calculation expression inside of a 3 calculation term.• In the Math input/output mode, the distance between partitions (n) is fixed at 1 and cannot bechanged. (a k, k,,, n) = a k = a + a +1 +........+ ak = (a k, k,,, n) = a k = a + a +1 +........+ ak =6 (k2 – 3k + 5)k = 26 (k2 – 3k + 5)k = 2
