Casio FX-9750GII-SC User Guide - Page 63
Quadratic Differential Calculations - integral
UPC - 079767186067
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• Inaccurate results and errors can be caused by the following: - discontinuous points in x values - extreme changes in x values - inclusion of the local maximum point and local minimum point in x values - inclusion of the inflection point in x values - inclusion of undifferentiable points in x values - differential calculation results approaching zero • Always use radians (Rad mode) as the angle unit when performing trigonometric differentials. • You cannot use a differential, quadratic differential, integration, 3, maximum/minimum value, Solve, RndFix or logab calculation expression inside a differential calculation term. • In the Math input/output mode, the tolerance value is fixed at 1E-10 and cannot be changed. I Quadratic Differential Calculations [OPTN]-[CALC]-[d2/dx2] After displaying the function analysis menu, you can input quadratic differentials using the following syntax. *(CALC)*(d2/dx2) f(x)atol (a: differential coefficient point, tol: tolerance) -dd-x2-2 ( f (x), a) -dd-x-22 f (a) * fx-7400GII: (CALC) Quadratic differential calculations produce an approximate differential value using the following second order differential formula, which is based on Newton's polynomial interpretation. 2 f(a + 3h) - 27 f(a + 2h) + 270 f(a + h) - 490 f(a) + 270 f(a - h) - 27 f(a -2h) + 2 f(a - 3h) f ''(a) = 180h2 In this expression, values for "sufficiently small increments of h" are used to obtain a value that approximates f"(a). Example To determine the quadratic differential coefficient at the point where x = 3 for the function y = x3 + 4x2 + x - 6 Here we will use a tolerance tol = 1E - 5 Input the function f(x). *(CALC)* (d2/dx2) T,B CTV T E * fx-7400GII: (CALC) Input 3 as point a, which is the differential coefficient point. B Input the tolerance value. @$ D U Quadratic Differential Calculation Precautions • In the function f(x), only X can be used as a variable in expressions. Other variables (A through Z excluding X, r, Ƨ) are treated as constants, and the value currently assigned to that variable is applied during the calculation. 2-25