Question about Texas Instruments TI-84 Plus Silver Edition Graphic Calculator

1 Answer

Tan Cos and Sin errors

Hello, i recently bought my TI-84 Plus graphing calc. and i went to do some angle math, when i kept getting wrong answers; because the Tan Sin and Cos are all wrong!
For Example: I i enter Tan( 3 and i get the answer -.1425465431
Cos is -.9899924966
Sin is .1411200081
Is this as simple as hitting reset? Or what should i do to help fix my calculator before school.
Thanks for Everything,

Posted by on

  • Spartan KC17 Aug 20, 2008

    Fixed it lol, i just changed the default Radian option in Mode to Degree. Thanks anyway.

  • Anonymous Jan 13, 2009

    thank you! !!


1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

Go to:

select DEGREE rather than RADIAN three lines down.

Posted on Jan 21, 2009

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Sin cos tan ti 83

Make sure you have the proper angle mode set. Press MODE and check the third line.

Feb 03, 2014 | Texas Instruments TI-83 Plus Calculator

1 Answer

How do i get inv on my TI-84 Plus caculator

To get the inverse trigonometric functions press the 2nd key then the trig function key. If you'll look at the key legends above the SIN, COS, and TAN keys you'll see the standard math notations for their inverse function.

Apr 05, 2012 | Texas Instruments TI-84 Plus Calculator

1 Answer

I dont know how to enter in a degree and get its COS, TAN, SIN ect.. Can anyone help me out with this.

Press the SIN, COS, or TAN key, type in the angle, and press ENTER. For example, to calculate the sine of 45 degrees, press SIN 4 5 ENTER

Make sure you have the angular mode set to degrees. It's the third line on the mode screen, which you get by pressing the MODE key.

Jan 30, 2011 | Texas Instruments TI-84 Plus Silver...

1 Answer

I have a TI-84 Plus Silver Edition calculator and I need to find the inverse key to get values for sin, cos, tan, csc, sec, cot. I'm past the lesson where you use the 2nd/sin, cos tan to find the...

There are no keys for cosecant, secant, and cotangent. You can calculate those ratios as

csc(x) = 1/sin(x)

sec(x) = 1/cos(x)

cot(x) = 1/tan(x)

Simply calculate the trig ratio on the right and then take its reciprocal.

Dec 14, 2010 | Texas Instruments TI-83 Plus Calculator

2 Answers

How do I put cosecant, secant, and cotangent functions into my ti-84 plus?

By definition
  1. cosecant of X =1/sin(X), must not be confused with arc sine [sin^-1]
  2. secant of X =1/cos(X), must not be confused with arc cosine [cos^-1]
  3. cotangent of X =1/tan(X), must not be confused with arc tangent [tan^-1]
Because of these simple relations, calculator makers do not implement them with specific key sequences.
On this calculator, you have two ways to calculate one of these functions. EX cosecant of 37 degrees
  1. You enter 1 / [sin] 37 [ ) ] [ENTER] result is 1.661640141
  2. You enter [sin] [ ) ] 37 [ENTER] followed by [X^-1] to take the reciprocal of the previous answer. The [X^-1] key is the one just below [MATH].
A word of caution: secant cosecant and cotangent must not be confused with the inverse trigonometric functions arcsin, arccos, arctan

Jan 21, 2010 | Texas Instruments TI-84 Plus Calculator

1 Answer

I am getting the wrong answers with the tan -1 function

That habit of TI, Casio, and Sharp to label the inverse trigonometric functions with the -1 superscript can cause confusions.
  1. The inverse trigonometric functions arcosine, arcsine, and arctangent (labeled by manufacturers as cos^-1, sin^-1, and tan^-1) should not be confused with the other trigonometric functions known as secant(x) =1/cos(x), cosecant(x)=1/sin(x) and cotangent(x) = 1/tan(x).
  2. To avoid errors in the use of the inverse trigonometric functions, one must be careful and set the angle unit to the one required by the problem at hand (degrees, or radians)
  3. To make the trigonometric functions really functions, their range is restricted.
  4. In this calculator arcosine (x) gives results between 0 and 180 degrees (if angle MODE is Degree) or between 0 and Pi radians (if angle MODE is Radian).
  5. The range of results for arcsine(x) and arctangent(x) is between -90 degrees and +90 degrees (if angle MODE Degree) or -Pi/2 and Pi/2 (if angle MODE is Radian)
With this information you should be able to set the angle unit correctly ([MODE][Radian] or [MODE][Degree] ) and interpret the results. If you want to extend the angle to other values, use the periodicity of the trigonometric functions.

Hope it helps

Nov 06, 2009 | Texas Instruments TI-83 Plus Calculator

2 Answers

Wrong trig ratio

Your calculator is set in radians. Press mode key. Arrow down to 3rd line. Highlight degree and press enter. Your calculator is now in degrees, not radians. To get out of the mode screen and back to home screen, press 2nd and then mode.

Aug 05, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

TI-84 Plus silver edition sin/cos/tan

for function = (sin,cos,tan,sec,cosec,cotan)
arc(function) = function^-1, calculated in the first quadrant for simplicity(0-pi/2) (0-90deg), as all functions repeat circularly
just another method of notation

Jun 19, 2008 | Texas Instruments TI-84 Plus Silver...

16 Answers

Need help withe the sin, cos, tan problem with ti - 83 plus

here are the steps in changing it from radian to degrees
1. turn on your TI-83 plus
2. press the MODE button near the top of your calculator
3.go down to options and move the highlight from radian to degree, press enter and clear
you're good to go

Feb 17, 2007 | Texas Instruments TI-83 Plus Calculator

Not finding what you are looking for?
Texas Instruments TI-84 Plus Silver Edition Graphic Calculator Logo

1,183 people viewed this question

Ask a Question

Usually answered in minutes!

Top Texas Instruments Calculators Experts


Level 3 Expert

96333 Answers


Level 3 Expert

7987 Answers

Stevan Milanovic

Level 2 Expert

243 Answers

Are you a Texas Instruments Calculator Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides