Question about Casio FX-115ES Scientific Calculator

# How to solve for the trigonometric functions in the casio scientific calculator?

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• Casio Master

Press the relevant function key [SIN],[COS],[TAN] followed by the angle value.
For inverse trigonometric functions [SIN^-1], COS^-1], or [TAN^-1], Press [SHIFT][SIN], [SHIFT][COS], or [SHIFT][TAN].
For other functions
sec(x)=1/cos(x)
csc(x)=1/sin(x)
cot(x)=1/tan(x)

When calculating trigonometric functions one must make sure that the angle unit the calculator is using is the correct one.

Posted on Aug 27, 2010

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Cos 3/2 (A+B)

Posted on Oct 06, 2011

Hi,
a 6ya Technician can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
Goodluck!

Posted on Jan 02, 2017

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## Related Questions:

### I have casio fx-82MS scientific calculator.which display 'd' letter on the screen.after i switched off the calculator even it wont delete.how do i get rid of that?and is it cause my reaguler...

Most likely you set the angle unit to degree. As long as you do not calculate trigonometric ratios you won't get incorrect results. Switch the angle mode to radian if that is what your calculations require.

Aug 21, 2013 | Casio FX-82MS Scientific Calculator

### Where is the inverse button on the casio fx-82ES

For the reciprocal of a number, enter the number then press the key marked with an x^-1. You might have to use the SHIFT key first. For inverse of trigonometric functions use the SHIFT key followed by the function name. The inverse of LN is e^x. The inverse of log is 10^x. To calculate the inverse of a matrix, enter the name of the (already created) square matrix then press x^-1.

Jan 09, 2012 | Casio FX-115ES Scientific Calculator

### The trigonometric functions of my casio are all wrong example: tan45=0,85 sin30=0,45399

Your calculator is set the measure angles in grads. To change this, press the MODE button one or more times until you see a line saying "Deg Rad Gra". Press 1 to select degrees or 2 to select radians.

Sep 01, 2011 | Casio FX82MS Scientific Calculator

### Cant find the arc or inverse button

The trigonometric function [SIN],[COS] and [TAN] have inverse functions arc-sine, arc-cosine, and arc-tangent which are also implemented on scientific calculators. To access the inverse trigonometric functions you use the sequences [SHIFT][SIN], [SHIFT][COS] and [SHIFT][TAN]. The functions are marked on the body of the calculator as [SIN^-1], [COS^-1] and [TAN^-1].
When you use these functions, make sure that the angle unit is correctly set (as required by the problem you are solving) because the angle values returned are in the same unit as the one set.

Jan 15, 2011 | Casio FX-115ES Scientific Calculator

### How to use calculator on how to evaluate trigonometric functions

The FX-115ES is somewhat different to other calculators you might know. The sequence of keys is more like writing up a calculation in a textbook, whereas for "normal" calculators operations are reversed in some places.
For example, with most calculators you would type 30 [sin] to calculate the sine function of 30 degrees, with the 115ES its [sin] 30 [=].

The 115ES has all the standard trigonometric functions:
• Standard functions (sin, cos, tan), type the [sin], [cos] or [tan] key followed by the argument.
• Inverse trigonometric (sin?¹, cos?¹, tan?¹), type [SHIFT][sin], [SHIFT][cos] or [SHIFT][tan] followed by the argument.
• Hyperbolic functions (sinh, cosh, tanh), type [HYP][sin], [HYP][cos], or [HYP][tan] followed by the argument.
• and finally inverse hyperbolic (sinh?¹, cosh?¹, tanh?¹), its [SHIFT][HYP][sin], [SHIFT][HYP][cos], or [SHIFT][HYP][tan] followed by the argument.
Arguments can be given as numbers with mantissa (2.718), as fractions (use the fraction key below [CALC]) or as degree, minute, second (30°12'45") using the [°'"] key for input. To switch between degrees (1 circle = 360°), radians (1 circle = 2?), or grad (1 circle = 400 gon), use [SHIFT][DRG>].

Jan 06, 2011 | Casio FX-115ES Scientific Calculator

### Hello there. I'm having some probs with my casio fx-83gt plus calculator when using some trigonometric functions. it gives me the wrong result, for example sine30* is shown as 0.4553... when everyone knows...

try changing you calculator to Degrees it should be the original setting, this can be done usually by removing the batteries or hitting a clear all memory on calc and it should be set to degrees. The reason you are getting "0.4553" is because it is in the radian mode (usually seen as RAD) so easy fix its not your calc its just an operator error.

Dec 07, 2010 | Casio FX83ES Scientific Calculator

### When i press the tan or cos or sin button it tell me scientific problem

I am sorry but a scientific problem does not appear to be a valid error message. If you get unexpected results or syntax errors when trying to use the trigonometric functions (sin, cos, tan) it can be due to one of two things.
1. Unexpected values: The angle unit (DEGree, RADian, GRADs) is not set to the one your problem requires. The default angle unit is RAD but the problems that students have to solve are usually cast in degrees. To correct the situation, change the unit to degree.
2. The syntax is incorrect: the order in the key sequence is not the right one. If you press [SIN] the calculator displays sin(. Note the parenthesis. It is a sure indicator that the angle must be entered after the function. After you enter the value of the angle you may enter the closing parenthesis. My recommendation is to always close the parenthesis.
If the foregoing remarks do not help you solve your problem, post to this thread, giving the EXACT WORDING of the message you get.

Jun 22, 2010 | Casio fx-300ES Calculator

### Does the fx-260 SOLAR do exponential calculations?

Hello,
Yes it does. All scientific calculators do logs, power, roots, exponential, trigonometric functions. Most do also hyperbolic and inverse hyperbolic functions.
Hope it helps.

Aug 16, 2009 | Casio FX-260 Calculator

### Locating the inverse key for trig. functions

hello,
Use [SHIFT] [COS^-1], [SHIFT][SIN^-1] and [SHIFT][TAN^-1] the keys are the same as the direct function, but they are accessed via [SHIFT].
Be carefule with the angle units when handling trigonometric and inverse trigonometric functions
Hope it helps

Dec 07, 2008 | Casio FX-300MS Calculator

### Problem with Casio FX 260 Calculator

Read the screen capture about the MODES of this calculators. DEG,RAD, and GRAD remind the user that the angle units in trigonometric function calculations and coordinate conversions are in degrees, radians or grads. They have nothing to do with the other calculations you are doing.

You can only remove DEG by changing the angle unit to RADians or GRADs. In so doing, the new unit indicator (RAD, GRAD) will be displayed instead. There is no point worrying about the angle unit indicator unless you are performing coordinate conversions or calculating trigonometric functions or the inverse trigonometric functions.

MODE 9 cancels the FIX display format: decimal are displayed with a fixed number of decimal places (set by the user). After this key sequence the decimal display format reverts to NORM(al).

Dec 03, 2008 | Casio FX-260 Calculator

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