Question about Casio fx-300ES Calculator
Posted by Anonymous on
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
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
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
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
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
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.
The answer is 68.75493542
Posted on Dec 07, 2009
SOURCE: CASIO fx-300ES
=: [ALPHA] [CALC](=)
A: [ALPHA][(-)] (A)
B: [ALPHA][ 0 ' "] (B)
X: [ALPHA][ ) ] (X)
Posted on Jan 15, 2010
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