# How to find antiln on a casio fx-300es - Casio fx-300ES Calculator

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• Casio Master

The inverse of the natural log (LN) is the exponential function e^x. they share the same physical key.

Posted on Aug 27, 2014

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Posted on Jan 02, 2017

Hello,
The Casio FX-300ES does not handle symbolic algebra. So it cannot factor a general polynomial expression. The methods can be found in any book on Algebra.
However if you are interested in approximate factorization of quadratic and cubic polynomials, you can use the calculator to do that. It can solve aX^3 +bX^2+cX+d =0 and the quadratic equations.

If you want to factor a cubic polynomial P3(X) = aX^3+bX^2+cX+d , you write the corresponding cubic equation as aX^3+bX^2+cX=d =0 , then you divide all terms of the equation by a to obtain

X^3+(b/a)X^2+(c/a)X+(d/a)=0.

You use the calculator to solve (approximately) this equation.
Suppose you find the 3 roots X1,X2,and X3. Then the polynomial X^3+(b/a)X^2+(c/a)X+(d/a) can be cast in the factored form (X-X1)(X-X2)(X-X3) and the original polynomial P3(X) can be written as

P3(X) = a*(X-X1)(X-X2)(X-X3)

You can handle the quadratic polynomial the same way.

P2(X) =a*(X-X1)(X-X2) where X1, X2 are the two real roots

Hope it helps.

Posted on Oct 17, 2009

Hello,
You have 3 keys for the main trigonometric functions: [SIN], [COS] and [TAN]
To use them correctly you must set the angle unit to the one your problem calls for.
Press [SIFT][MODE] [3:Deg] for degree, [4:Rad] for radian, [5:Grad] for grad. Dependig on angle unit chosen a small D, R, or G appears on the top of the screen.

If you need the inverse trigonometric functions arcsine, arccosine, arctangent, you access them by first pressing the [SHIFT] key
Thus
arcsine [SHIFT][SIN] (sin^-1)
arcosine [SHIFT][COS] (cos^-1)
arctangent [SHIFT][TAN] (tan^-1)

The syntax for the function is
[SIN] # [ ) ] [=]; [SIN] 30 [ ) ] [=] gives 0.5
[COS] # [ ) ] [=] [COS] 19 [ ) ] [=] gives 0.945518576

Note: if the argument of the functions are numbers, the right parenthesis is not necessary. But if the argument is an expression (with various operations) better put the parenthesis to make sure the calculator is performing as one wants it to.

By the way, there are no keys, or key combinations to calculate cotangent, cosecant, and secant, but you can use the definitions:

cotangent (x) = 1/tan(x) Do not confuse it with tan^-1
cosecant(x) = 1/sin(x) Do not confuse it with sin^-1
secant(x) = 1/cos(x) Do not confuse it with cos^-1

Hope it helps.

Posted on Oct 30, 2009

Hello,
You use the key combination [SHIFT][ANS] (DRG>).

If the default angle unit is degree
Type in the angle value in radian, say 1.2.
Press [SHIFT][ANS] (DRG>).
The screen displays 1: deg symbol, 2: a raised r for radian, and 3; a raised g (for grad).

1.2 [SHIFT][ANS] (DRG>) [2: raised r] .
The screen displays 1.2 with a raised r to the right of the 2.
Press [=].

Posted on Dec 07, 2009

SOURCE: CASIO fx-300ES

Storing

1. To store numerical values in the variables A,B,C,D,X,Y and M you use the [SHIFT][RCL] key combination to access the (STOre) function.
2. In what follows [ key] is the physical key and (key) is the SHIFTED key
3. ex: store the value 13 in variable A
4. 13 [SHIFT][RCL] (STORE) [(-)] (A)
5. The calculator displays 13 --> A on top line and 13.000.. on bottom line.
Recalling
• To recall a value stored in a variable ex: recall value stored in variable A
• Press [RCL][(-)] (A)
• Calculator displays A on top line and 13 on bottom line.
If you need to use the variables A,B,C,D,X,Y, and the = sign to create an expression to be solved with the solve( function you must press the [ALPHA] key

=: [ALPHA] [CALC](=)
A: [ALPHA][(-)] (A)
B: [ALPHA][ 0 ' "] (B)
X: [ALPHA][ ) ] (X)
Y:[ALPHA][S<=>D] (Y)
etc.

Posted on Jan 15, 2010

SOURCE: i have a fx-300ES casio

Press SHIFT MODE 2 to select LineIO mode. Now all results will come out in decimal form.

Posted on Aug 31, 2010

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## Related Questions:

### Can I use the Casio fx-300es do figure derivatives?

Sorry, but you cannot. Other calculators that have this capability are the FX-115ES and the FX-991ES.

Aug 12, 2011 | Casio fx-300ES Calculator

### How do I multiply by Pi. (Where's the Pi button on the Casio fx-300ES)

pi is the shifted function of the x10^x key, middle of the bottom row.

Apr 05, 2011 | Casio fx-300ES Calculator

### Will the CASIO fx-300ES find the antilog? If so, how do I use this function?

Antilog is a somewhat outdated terminology for the inverse function of the logarithm.

To calculate on your FX-300ES the base 2 antilog of 4, key in

Correct result is 16.

Jan 20, 2011 | Casio fx-300ES Calculator

### How do i change a fraction to a decimal on my casio fx-300es

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

Oct 04, 2010 | Casio fx-300ES Calculator

### How do i use the fx-300es to graph

Sorry but you cannot do that. This is not a graphing calculator. However you can generate a table of values for your function (MODE TABLE) and use it to graph the curve by hand (pencil and paper).

If you need a Casio graphing calculator, one of the cheaper ones is the Casio FX-9750GII. Equivalent Texas Instruments calculators are the TI83PLUS/TI84PLUS.

Aug 31, 2010 | Casio fx-300ES Calculator

### How do I get decimal answers

I had the same problem. To change the output to decimals, do the following:
Go to Math mode, then SHIFT, MODE (set-up), 2 (lineIO). This will cause answers to show in decimal format. I hope this helps.

I was able to find a manual at: http://www.generalmanual.com/Calculators/Casio-FX-300ES-Scientific-Financial-Calculator.htm

Nov 06, 2007 | Casio fx-300ES Calculator

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