Question about Casio FX-260 Solar Scientific Calculator 1 EA CSOFX260SOLAR

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The math problem is x2= 85-84 cos25 and it doesn't work on the fx-260

I have to use the cosine law but i don't know how to work with the calculator to get the correct answer which is 3. Please Help

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  • k24674 Jan 22, 2013

    If you take the square root of 8.87015 you get 2.978279705 which you can round up to 3.

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85-84cos(25 deg)=8.87015 and I do not see how you get 3. If angle is in radians the answer is 1.73896. Make sure your calculator is configured to use the right angle unit (radian, degree or gradian).

Posted on Jan 20, 2013

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Posted on Jan 02, 2017

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SOURCE: Manual for the casio fx-260 solar fraction calculator

FX-260Solar User Manual

Posted on Feb 09, 2009

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SOURCE: problems with fractions on the Casio fx-115es

Hello,
To convert fractions to decimals or decimals to fractions, you use the [S<->D] key. Each time you press the key the result is displayed in the other format.
Alternatively, If you multiply or divide two integer numbers put a decimal mark at the end of one of the numbers (any one). The result will be displayed in decimal format.

Hope it helps.

Posted on Sep 12, 2009

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SOURCE: Hi, I have a Casio calculator fx-991MS giving me wrong answers!

Hello,
I am only looking for a plausible cause of the error, because I do not believe your calculator can make such a mistake. I think you accidentally activated the Exponential display format and did not pay attention to the small, raised -03 that came at the end of the number displayed. It is a common mistake for those not very familiar with Scientific or exponential notation.

Let us try to reset your calculator to the normal (floating point) format.
Press the [MODE] key a number of times until you reach a screen that has FIX, SCI, NORM and under each one a number (FIX 1, SCI 2), Norm 3). To have the number of decimal place you gave in your result (4 decimal digits), you press 1 to select Fix then 4.

Be aware that scientific calculators usually stop displaying results in floating point format ( 0.0000045 ) if the number is smaller then 0.001. So basically, 0.00099 will be displayed as 9.90-04, -04 being raised above the level, and in smaller size.

Hope it helps.

Posted on Oct 02, 2009

Testimonial: "Thanks so much, its working now:) I thought I was going to have to buy a new calculator!"

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SOURCE: how to use the cosine,tangent etc functions of

Hello,
1.Set the correct angle unit required by your problem: degrees, radians, or grads. [SHIFT][MODE] [3:deg] or [4:Rad]

2. Press the key for the function COS, SIN, or TAN
[COS] displays Cos(

3.Enter the angle 12 deg Screen shows cos(12
Close the right parenthesis ) Screen shows cos(12)
4.Press [=] Screen displays 0.9781

If you want the inverse trigonometric functions you access them with arccos [SHIFT] [COS] (cos^-1)
arcsin [SHIFT][SIN] (sin^-1)
actan [SHIFT][TAN] (tan^-1)

You have to know the principal domain for the inverse trigonometric functions (see any book on trigonometry) to understand the results.
Hope it helps.

Posted on Nov 05, 2009

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SOURCE: how do i calculate the pH of a solution on the

General shortcut.
If the concentration is of the form 1* 10^ (-a) where a is an integer between 0 and 14, the pH is given by a.
c= 1.* 10^(-5), pH=5
c=1.*10^(-11(, pH=11.

For other values, ex: c=3.68 *10^(-8)
pH: 3.68 [EXP] [+/-] 8 [LOG] [+/-] Result is 7.434
Above, the [+/-] key is the change sign key, just above the [7] key.

Posted on Mar 16, 2010

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Gemma,


You won't need a calculator for this. The cosine of 'a' + 'b' is a semi-important math identity:

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Taddahh!

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Ok so my math hw only gave me the degree, minute, sec format of the angle. How do i input it in the fx 155 es to work out and find the rest of the angles, sides, etc?


Label of key [deg symbol ' "]. It is between [(-)] and [hyp]

To enter a value in decimal degrees
12.58 [deg ' "] [=] Screen displays 12.58 deg on top line and 12 deg 34' 48" on bottom line.
Pressing the [deg ' "] key while this value is displayed will show 12.58

To enter a DMS value:

Press the [deg ' "] key after each number even if one of the numbers D,M,S is nill (0).
Exemple Enter 25 deg 0 ' 48"
25 [deg ' "] 0 [deg ' "] 48 [deg ' "] [=]
Screen displays 25 deg 0' 48" on bottom line
Pressing the [deg ' "] key converts this result to decimal degrees 25.013

This showed you how to enter angles in DMS or DD. For the rest 'find the angles, etc.' you should refer to your trigonometry manual: You have the definitions of the trigonometric ratios, the sine law, the cosine law to resolve triangles.

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Try 4 x cos 7 5 . 8 =

The fx-300MS is a more advanced calculator than what the book is describing. It evaluates cosine(x) as cos x rather than x, cos.

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I'm trying to figure out if my Casio fx-260solar calculator can do construction calculations without having to buy a construction master pro calculator if that is possible.


This is a general scientific calculator designed to handle the most common mathematical calculations (at a not too advanced level). It is not designed to handle construction mathematics directly.
However, if you have a collection of construction math formulas and you know how to use the FX260 Solar, I have no doubt that it can handle all your problems. But it will require too much effort in a construction context. Better get a specialized one.

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