Question about Texas Instruments TI-Nspire CX CAS Handheld Color Graphing Calculator with Computer Algebra System

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Ti Nspire CX CAS Radian and Degree modes not switching

When I switch between radian and degree modes I get the same answer. I know how to switch modes no problem, yet when I ask it to solve say arctan (2/3), it gives me the same answer for both radian and degrees. I make sure after each time that it is on each setting. What could be wrong with my calculator?

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Posted on Jan 02, 2017

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SOURCE: Hi, can you tell

No need for such a program. You can specify the angle unit for a calculation regradless of the angle unit currently set as default.
For the TI Nspire with Touchpad.
Calculate the sine of 30 degrees.
Press the trig> button next to = on the left side of keyboard.
Select sin and press ENTER
Type in 30
Press the key with the question/Exclamation marks.
Use right arrow to highlight the degree symbol.
Press ENTER. No need to close parenthesis.
The answer is displayed as 0.5.

To enter an angle in radian (regardless of the angle unit set as default.
Do as above to type in the function
Type in the angle.
Press the small button marked with Pi and arrow (To the left under the EE button)
Use the arrow to highlight the small superscript r.
Press ENTER


For TI Nspire with ClickPad
Press the trigonometric function key.
Enter the angle
Press the key with infinity symbol, beta, degree (below the Clear button.
At the top of the list where the Pi symbol is you will find the degree,radian, and gradian symbols.
Append the one you want and and press ENTER.

Posted on Sep 07, 2011

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SOURCE: need to know how to obtain the cot,csc, and see in

Hello,
There are no dedicated keys for these trigonometric functions, for the simple reason that they can be obtained from the tan, sin, and cos by a simple division.
cotangent (x) =1/tan(x) . Do not confuse with the arc tangent tan^(-1)
cosecant (x) = 1/sin(x) . Do not confuse with the arcsine sin^(-1)
secant(x) =1/cos(x) Do not confuse with the arccosine cos^(-10)

If you know how to use the tan, cos, and sin, with angle unit in degrees or radians, then there will not be any problem

If angle unit is degree, any number you give a trigonometric function is interpreted as degree. For instance if mode is in degree , and you calculate cos(PI) do not expect the value -1. You will have the value corresponding to the cosine of of 3.14159 degrees, namely 0.99849715

Now for you if you are interested.
If [MODE] is in degrees you can still enter angles in radians
You use the [2nd][ANGLE] [3: raised r] [ENTeR].
Here is a screen capture to show you more clearly.

fc7187b.jpg
The raised r is obtained by [2nd][ANGLE][3: raised r] [ENTER]

Hope it helps.

Posted on Oct 14, 2009

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1 Answer

Arctan not giving correct answer.


I think you answered your own question. You are in degree mode and in your questions, you are using pi, so you should be in radians?

Good luck,

Paul

Nov 17, 2015 | Office Equipment & Supplies

1 Answer

Ti-nspire cx CAS gives answer in degrees even though it is in radians mode.


When you set some configuration parameter you must scroll down the setup until you reach the OK button. Press the OK button to validate.

Oct 09, 2014 | Texas Instruments TI-Nspire CX CAS...

1 Answer

I have to take the secant of -1.2. I'm supposed to get a degree. I can't figure out the order to push buttons. PLEASE help!


TWO THINGS YOU NEED TO KNOW, Eli.1. Secant will NEVER return a degree measure (or even a radian measure) no matter what computer or calculator you use. The reason is because secant returns the ratio of sides (hypotenuse over adjacent), which has a range of and find its reciprocal (ie, flip the number upside down: the reciprocal of 5 is one-fifth). That's all.B. TI-84 only uses the three basic trig functions. Secant is the reciprocal of cosine. Therefore, in order to find the secant of -1.2 radians you need to be in Radian mode (see #2 above). From there, you just find the cosine of -1.2 and take that values reciprocal (ie, flip the number upside down: the reciprocal of 10 is point one) . That's all. Math lesson: 1 Radian = 180 Degrees. Therefore, 1.2 Radians is roughly one-third of pi, therefore it is roughly one-third of 180 degrees; therefore -1.2 radians would be nearly -60 degrees (a very friendly angle measure). I hope that helps If not, you should call Texas Instruments because they've got friendly people who are happy to assist anyone. Questions like this are right up their ally, advanced questions like the syntax of the poisson cumulative distribution function are not. So, you're fine. For in depth math help holler at www.THEMATHCHEETAH.comIn Short: Secant returns ratios and NOT degrees or radians. Secant is the reciprocal to cosine. Arcsecant WILL return degrees/radians. Your calculator can be set to either mode.TEXAS INSTRUMENTS >>>>> all calculators ever made.

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

1 Answer

Arctan function is not computing correct answers. for ex. artangent or tan-1(1) = .785 not 45 degrees


Perhaps you need to go to "Mode" and switch "Radian" to "Degree" or vice versa.
I'm not entirely sure because I don't follow any more math/science classes, but I remember there sometimes being a problem with those specific settings.

Mar 06, 2011 | Texas Instruments TI-83 Plus Calculator

1 Answer

How do i use the tan option to figure out an angle when I have the Tan D amount


use the arctan function - arctan gets you back to the angle, tan gets you the value of opp/adjacent remember you note if you want radians or degrees

Jan 29, 2011 | Texas Instruments TI-83 Plus Calculator

1 Answer

I get ERR:DOMAIN every time I enter an inverse trig function


Is your Ti83 plus in degree mode. You can change to radians by pressing the MODE key, and sliding down 2 more positions, and press the ENTER key. Because you got this error your principle value for x and y should be examined. Generally you really should be in radian mode when working with arcsin (aka. sin^-1), and arccos. You probably weren't using arctan because, you would have never gotten this error message due to the fact it goes on forever. And this way your answers for y= arcsin(x), or arccos(x) will be on the x axis, and domains at 0, pi/2, and pi.

You can work in degree mode but, if the number you place in the brackets of your arc sin or arc cos function is larger than 1 or smaller than -1 you will get a ERR:DOMAIN. Using the arctan or (aka. inverse tan) function in the degree mode can be used for computing endless waves, or as an angles that are usually in brackets of cosine or sine. Example: cos(arctan(Beta). This functions that y to never be greater than 1 or, less than 0. Example: sin(arctan(angle). This functions that y to never be less than -1 or, greater than 1.

I hope this answers your question to why you got this error and, helps you to decide on what the correct mode setting should be.

Dec 17, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

How do find the arctan


The arctangent is the second function of the TAN key on the second row of the keyboard. Make sure you're in the proper angular mode (degrees or radians). Put in the angle, press 2nd TAN^-1, then =.

Nov 05, 2010 | Texas Instruments TI-30XA Calculator

1 Answer

For get the life of me I can not figure out how to get the degree of a cos angle. For ex. cos theta = 6.5/25 = 0.26 now how do I find the degree? Shouldnt it be 2nd key + cos + 0.26 + enter? the answer...


When using trigonometric functions (cos, sin, tan) and their inverses (arccos, arcsin, arctan) one must be aware that the result will depend on the default angle unit : radian, degree, or grad.

Apparently you are working with the degree as the angle unit, so you must configure the calculator for that unit. (See screen capture below)
Press [SHIFT][MODE] [3:Deg]

76276da.jpg

Jul 29, 2010 | Casio FX-115ES Scientific Calculator

1 Answer

I have a SHARP EL-501W calculator and i am getting the wrong answers with the tan -1 function


Hi,
The source of errors is most certainly due to the wrong schoice of angle unit (degree or radian). If the default angle unit set in your calculator is the degree, any value fed to the trigonometric functions (sin, cos, tan) is considered to be expressed in degrees. Consequently, if you calculate the arctangent ( tan^-1) of a value, the angle returend by that inverse trigonometric function is expressed implicitly in degrees.

Similarly if radian is the default angle unit in your calculator, any angle returned by an inverse trigonometric function (arcos, arcsin, arctan) is in radian.

Set the default angle unit as the one required by your problem at hand. This way, the angles returned will be in the right unit and you will not have a problem of interpretation.

Hope it helps.

Dec 07, 2009 | Sharp EL-501WBBL Calculator

1 Answer

Wrobg answer whenever I use radians


Hello,
To avoid problems,set your angle unit to radians by default. Press [MODE]. If Radian is highlighted (text on black background), it is indeed the default mode. If Degreee is highlighted, scroll dowm to the line and use the left arrow to select Radian and press ENTER. Radian will start blinking.
Any number you feed a function that acts on angles (sin, cos, tan) will be considered in radians. Any result that comes out of the inverse trigonometric functions (arcsin, arccos, arctan) is in radian. The angle coming from a conversion from cartesian coordinates to polar coordinates is in radian.
You have a simple way to convert the value from radians to degrees because 1 rad=180/pi. Store this value in a variable [STO->] D
180/[2nd][PI] [STO->] D

Since the last result is always stored in [Ans] all you have to do is to multiply by D: [Ans][x][ALPHA]D converts results in degrees.

Hope it helps

Sep 14, 2009 | Texas Instruments TI-83 Plus Calculator

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