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Casio fx-991ES PLUS User Manual

Casio fx-991ES PLUS
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Example 2: ∫(
1
x
2
, 1, 5, 1 × 10
-7
) = 0.8 (LineIO)
1 (X) (,) 1 (,) 5
(,)
1 7
0.8
Example 3:
π
0
(sin x + cos x)
2
dx = π (tol: Not specified) (MthIO-MathO)
(Angle unit: Rad)
(X) (X)
0
(π)
π
Integration Calculation Precautions
Integration calculation can be performed in the COMP Mode only.
The following cannot be used in f(x), a, b, or tol: Pol, Rec, , d/dx, Σ.
When using a trigonometric function in f(x), specify Rad as the angle
unit.
A smaller tol value increases precision, but it also increases calculation
time. When specifying tol, use value that is 1 × 10
-14
or greater.
Integration normally requires considerable time to perform.
Depending on the content of f(x) and the region of integration,
calculation error that exceeds the tolerance may be generated, causing
the calculator to display an error message.
The content of f(x), positive/negative values within the integration
interval, and the interval to be integrated can cause large error in the
resulting integration values. (Examples: When there are parts with
discontinuous points or abrupt change. When the integration interval is
too wide.) In such cases dividing the integration interval into parts and
performing the calculation may improve calculation accuracy.
Tips for Successful Integration Calculations
When a periodic function or integration interval results in positive
and negative f(x) function values
Perform separate integrations for each cycle, or for the positive part and
the negative part, and then combine the results.
31

Table of Contents

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Casio fx-991ES PLUS Specifications

General IconGeneral
TypeScientific
CoverNo
Form factorDesktop
Control typeButtons
Product colorGray
Digits15 digits
Display typeDot-matrix
Display resolution96 x 31 pixels
Display number of lines10 lines
Storage media typeNot available
Battery life3 year(s)
Battery typeLR44
Power sourceBattery/Solar
Number of batteries supported1
Symbolic notationSquare root
Conversion betweenDecimal, Fraction, Percent
Convert angles from degrees toGradian, Radian
Random number/integer generatorYes
Weight and Dimensions IconWeight and Dimensions
Depth162 mm
Width80 mm
Height11.1 mm
Weight95 g

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