Question about Texas Instruments TI-83 Plus Calculator

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Using tan tan(212.21/18.41) the answer is 22.99 i get .007

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  • manu_23_86 May 11, 2010

    how do you type "tan tan(212.21/18.41)"? check your question please

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Make sure your calculator is in degrees.

Press Mode, then choose move down to where you have a choice between Degree and Radian. Highlight Degree.

Second-Mode to Quit. You should be set.

Posted on Oct 06, 2009

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The answer of tan(212.21/18.41) is 0.20394105 in degrees and -1.7015991 in rad
try to do it in the computer calc and you will see the real answer

Posted on Oct 07, 2009

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1 Answer

How to use tan^2(55)


It's a quirk of notation. When a book says tan^2(x), it actually means (tan(x))^2. Only the trigonometric and hyperbolic functions seem to get written this way. If one wants the square of a logarithm, for example, one doesn't write log^2(x).

The short answer: if you want tan^2(55), calculate tan(55) then square it.

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I keep getting the wrong answers to trignometry equations on my TI-nspire touchpad


You can see on the images below graphs of the function y=tan x and y=arc tan x and calculations for your problem


y=tan x
3_23_2012_2_09_39_pm.jpg
3_23_2012_2_17_00_pm.jpg



y=arc tan x
3_23_2012_2_18_20_pm.jpg
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1 Answer

Cot(x) = -0.6


Let's start with a little background.

The cot(x) is also known as the cotangent(x) and it equals 1/tan(x) which equals cos(x)/sin(x). I'm showing these formulas because your calculator may not have a cot button but it will probably have buttons for tan, cos, and sin.

Your calculator may also have buttons for tan-1, cos-1 and sin-1. These are the inverse functions for tan, cos, and sin. If you enter a number and then push the tan-1 button, the result is the angle whose tangent is the entered number. For example, it you enter 1 and push the tan-1 button the answer will be 45 deg because tan (45 deg) = 1.

Now let's look at the problem, cot(x) = -0.6.
The first thing we need to know is do you want the answer in degrees or radians? Your calculator will have both modes. The default mode when you first turn it on is probably degrees. If this problem is in radians you will need to change the mode of your calculator over to radians before we start.

If cot(x) = -0.6, then tan(x) = 1/-0.6 from the formula I showed in the background section.

This means tan(x) = -1.6666666...

Now we just enter -1.66666667 and hit the tan-1 button to get the answer.

If we're operating in radians the answer is -1.0307 radians.
If we're operating in degrees the answer is -59.036 deg.

I hope this helps you out.

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1 Answer

How to I use the tangent mode on my texas instrument calculator. For instant; if I want to solve 14720/tan 2 degrees.


You would enter 14720*2 tan make sure you press = sign after and get your answer.

14720*2 TAN = 514.034

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1 Answer

Using Tan,sin, cosin


Alot of people seem to be having this problem. Angles can be measured in two units, degrees and radians. Your calculator is currently doing everything in terms of radians. I have an 84 but I'm sure the 83 is similar, go under MODE and look for Degrees and Radians and make sure you choose degrees. if you have to convert 360[degrees] = 2* pi [radians]
(easy to remember, 360deg in a circle, 2pi radians in a circle)
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1 Answer

How to use the cot function


I don't have a Cot button but Cot x = 1/Tan x so enter

1/Tan 78 = 0.212556 etc if you have a fraction button you can write it that way too:

1 frac button Tan 78 = 0.212556 etc

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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

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