User Manual

2-28
• 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
• You can interrupt an ongoing quadratic differential calculation by pressing the A key.
• Always use radians (Rad mode) as the angle unit when performing trigonometric quadratic
differentials.
• You cannot use a differential, quadratic differential, integration, Σ , maximum/minimum value,
Solve, RndFix or log
a
b calculation expression inside of a quadratic differential calculation
term.
• With quadratic differential calculation, calculation precision is up to five digits for the
mantissa.
• In the Math input/output mode, the tolerance value is fixed at 1
E –10 and cannot be changed.
k Integration Calculations [OPTN] - [CALC] - [ ∫ dx ]
To perform integration calculations, first display the function analysis menu and then input the
values using the syntax below.
K4(CALC) * 4( ∫ dx ) f ( x ) , a , b , tol ) * fx-7400GIII: 3(CALC)
(
a
: start point,
b
: end point,
tol
: tolerance)
Area of
∫
a
b
f
(
x
)
dx
is calculated
As shown in the illustration above, integration calculations are performed by calculating
integral values from
a through b for the function y = f ( x ) where a < x < b , and f ( x ) > 0. This in
effect calculates the surface area of the shaded area in the illustration.
Example 1 To perform the integration calculation for the function shown below,
with a tolerance of “
tol” = 1E – 4
Input the function f ( x ).
AK4(CALC) * 4( ∫
dx ) cvx+dv+e,
* fx-7400G
III: 3(CALC)
∫
(
f
(
x
),
a
,
b
,
tol
)
⇒
∫
a
b
f
(
x
)
dx
∫
1
5
(2x
2
+ 3x + 4) dx