Question about Casio Fx-991es Scientific Calculator

# Does the casio fx-991ES have a computer algebra system

Posted by Anonymous on

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Posted on Jan 02, 2017

SOURCE: mode change

Hello,
Just so that we know what we are talking about. The natural display is the display mode in which fractions appear on two lines, radicals appear as radicals, log can be calculated in any base, etc. If that is what you understand by Natural Display, we are in agreement.
To set this mode, you turn calculator ON and press [SHIFT][MODE] (setup). The option is called MathIO, and it has the number 1.
Thus [SHIFT][MODE][1:MathIO].
Hope it helps.

Posted on Oct 13, 2009

Hello,
Just in case : Press [SHIFT][CLR] (9) [3: ALL] to reset the calculator and try [MODE] again.
If that does not work, your calculator may be defective or a fake (not the genuine article). If at all possible, return it to where you bought it and get a refund.

Here is a picture of the FX-115ES, its face looks like the 991ES. Hope I am mistaken.

Posted on Oct 18, 2009

Hello,
To avoid errors make sure that the angle unit is THE ONE required by your problem. To verify or to change the angle unit press [SIFT][MODE] and select [3: Deg] for degrees, [4:Rad] for radians, or [5:Grad] for grads.

Convert from rectangular to polar

[SHIFT][+] (Pol) . Screen displays Pol(
You enter the X-coordinate, and the Y coordinate separated by a comma, then you close the parenthesis and press [=].

Exemple: Polar coordinate of the point (1,1)
Pol( 1, 1) gives
r=1.414213562 (square root of 2)
θ=45

Here is how you enter it
Press [SHIFT][MODE][2:LineIO]
[SHIFT][POL] 1 [SHIF] [,] 1 [)] [=]

The screen displays
Pol(1,1)
r= 1.414213562
θ= 45

Convert from polar to rectangular coordinates

Exemple: Recatngular coordinates of (r=3, θ=60°)
[SHIFT][Rec] 3 [SHIFT][,] 60 [ ) ] [=]
The screen displays
Rec(3,60)
X= 1.5
Y= 2.598076211

Hope it helps.

Posted on Nov 15, 2009

Testimonial: "thanx that was very helpful"

SOURCE: i want casio fx-991es result

To convert a single result to decimal, press SD. To have all results come out in decimal, press SHIFT MODE 2 to select LineIO mode.

Posted on Oct 04, 2010

SOURCE: I'm using Casio fx 991ES,

Press SHIFT MODE 2 to switch to LineIO mode.

Posted on Oct 21, 2010

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You cannot. It will be of no use to you on this calculator because it cannot do algebra.

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why cant they include infinity symbol ? sometimes i feel my calculator is so dumb !

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### How to get infinity symbol

You cannot. The calculator does not have a Computer Algebra System or CAS. If you are trying to calculate an integral over an infine interval, you must try some high values to simulate infinity and find a value after which the value of the integral stops changing .

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### How we can multiply two algebraic equation in 991 ES CASIO calculators

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Casio calculators that have a CAS are the Casio ClassPad CP330/ 300Plus/ 330, or the Algebra FX 2.0.

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