Question about Casio FX83ES Scientific Calculator

# HOW DO I CHANGE THE COSINE BACK TO THE ANGLE - Casio FX83ES Scientific Calculator

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To get the angle from a value of the cosine, you use the arc cosine or arcosin function. It is the shifted function of the cosine key. Be careful with the units. If the calculator is configured with the degree angle unit, the value returned by the arc cosine will be in degrees. If the angle unit is the radian, the result will be in radians.

Posted on Nov 27, 2012

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## Related Questions:

### When ever i press sin^-1, and type in a number, the answer is always "domain error" on my ti 30x iis, how can I fix this problem?

Not quite true. (Explanation at the end)
The sine and cosine of an angle have values in the closed interval [-1,1]. That means whatever the value of the angle, its sine or its cosine cannot be less than -1 or greater than 1.
When you consider the inverse problem where you want to find the angle whose sine or cosine is known, you must take the values of the sine or cosine in the interval [-1,1]. That is the domain of the functions arc sine and arc cosine. So if you take a value outside the domain [-1,1], and want to calculate the angle to which it belongs, the calculator signals that there a domain error, because there is no angle that answers the question. Limit the arguments of the sin^-1 and cos^-1 to values in [-1,1]
For the inverses of arc tangent and arc cotangent functions there is no domain limitation because the range of tangent and cotangent is the whole real line ]-infinity, +infinity[.

Mar 30, 2014 | Office Equipment & Supplies

### Inverse cos of 52 degrees

The cosine of 52 degrees is about .6157 . The inverse cosine of .6157 is 52 degrees.

52 degrees is a measure of an angle. .6157 is a distance. The cosine of an angle results in a distance, while the inverse cosine of a distance results in an angle. There is no such thing as the inverse cosine of an angle, just as there is no such thing as the cosine of a distance. It's like asking "How heavy is one hour?"

If you're asking how to calculate a cosine or inverse cosine on your calculator, please specify the make and model of the calculator.

Jan 08, 2013 | Office Equipment & Supplies

### I'm trying to do inverse sine and cosine equations but I'm receiving a message that there is a domain error. Is there anything I can do or press like a reset button?

The inverse sine and cosine equations mean "angle who's sine/cosine is:" The bounds of the arguments for these functions must be between 1 and -1, the maximum and minimum values of the sine and cosine functions, because no angle can have a sine or cosine that is greater than 1 or smaller than -1. Also it should be noted that the inverse sine/cosine function is not the same as 1/sine or 1/cosine, although the symbol makes it look like that.

Mar 08, 2011 | Texas Instruments TI-84 Plus Calculator

### How to use Texas Instruments TI34II Calculator? Especially I want to now how to use sinus, cosinus, and tangen on it. In Indonesia we call it "sin, cos, tan" Need your help, thanks.

Sinus, cosinus, and tangens (Latin names) are the same as sine, cosine, and tangent (full English names), which are abbreviated to sin, cos, and tan. If you're asking how to use these functions, they deal with right triangles and finding the missing angles or side lengths of the triangle.

Using this picture, the sine of angle A equals a/c, the tangent of angle B equals b/a, and the cosine of angle A equals b/c, and so on.

In a calculator, simply hit the desired function (sin, cos, or tan), then in parenthesis put the measure of the angle, and then use what you know about the triangle to find out the rest.

Mar 03, 2011 | Texas Instruments 30XIISTKT1L1A Calculator

### I can't seem to be able to figure out how to find the cosine tangent or sine of an angle...Help?

Unlike traditional calculators, the FX9750G uses textbook order to call functions. For example, to calculate the sine of 45°, you key in (angle argument unit set to degrees assumed):

[sin] 45 [EXE]

Cosine and tangent are analogous. Argument format can be degrees, radians or grad. You can set up the angle argument unit by keying in:

[SHIFT] [SETUP] [v] [v] [v] [v] and then
• [F1] (Deg) [EXIT] for degrees (1 full circle = 360°),
• [F3] (Grad) [EXIT] for grad (1 full circle = 400 gon).

Jan 07, 2011 | Casio FX9750GII Graphic Calculator

### Find length of right triangle given one angle an one length

Formulas relating to right angled triangles are:
Sine = perpendicular divided by hypotenuse
Cosine = base divided by hypotenuse
Tangent = perpendicular divided by base
Sine Tangent and Cosine functions are all available in Excel

Aug 08, 2010 | Microsoft Excel for PC

### I know the cosine and need to know how to enter it to get the angle. The cosine is .5553, what do I push to find out the angle?

2ND cos^(-1) . 5 5 5 3 ENTER

arccos is the same key as the cos, two keys above the 8. The result will be in whichever angular mode you have selected. To change the angular mode, press MODE and select between "RADIAN" and "DEGREE".

Apr 23, 2010 | Texas Instruments TI-83 Plus Calculator

### How to use a calculator to convert 0.5 to a cosine angle

Let su rephrase the question, just to be sure we are on the same wavelength. The cosine of an angle is 0.5: What is the value of the angle? Right?.

First of all you must set the angle unit to degree or radian.
1. Press [SHIFT][MODE\ and select the appropriate unit.
2. Press [SHIFT][COS] to access the arc cosine function (COS^-1) enter 0.5, close the right parenthesis and hit [=]
If you unit is the degree you should find 60 degrees.
If the angle unit is the radian, the result should be 1.045 radian.

Mar 10, 2010 | Casio FX-115ES Scientific Calculator

### My ti30x will not do cos-1 when i type it in i get domain error

The cosine function takes its value on the whole real line, the angle domain spans ]-infinity, + infinity[. The range of the function is however limited to the [-1, +1] interval.
Thus if you want to calculate the arc (angle) from the value of the cosine, the cosine must be in the interval [-1, +1]. Any value outside this domain will give you a domain error.
Check that the values you feed to the arc cosine function are in the interval [-1,+1].

If the angle unit is the degree the value returned bay [cos^-1] is in degrees, and if the angle unit is the radian, the value returned is in radians

Mar 04, 2010 | Texas Instruments TI-89 Calculator

### What is the value of SIN15 degree and COS15 degree.....?

Hi rowanwah

The sine of an angle is only applicable is a right triangle. If you just want a number, ie, the actual value of the sine 15 degrees you can look it up on Google. Do a search for "sine and cosine functions"

If you want the mathematical description of the sine of an angle it is described as follows
In a triangle ABC, there are 3 angles angle A, angle B and angle C. There are also 3 sides, Side AB, Side AC and side BC. The sine of angle A is equal to the side opposite Angle A divided by the Hypotenuse (the longest side opposite the right angle)
The Cosine of angle A is equal to the side adjacent to Angle A divided by the hypotenuse

Hope this helps Loringh PS Please leave a rating for me Thanks

Nov 15, 2008 | Super Tutor Trigonometry (ESDTRIG) for PC

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