If you want to know what degree value is associated with e.g. a tan value

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To calculate the arctangent, use 2ND TAN. For example, to calculate the arctangent of 1, press 2ND TAN 1 ENTER

Posted on Jun 08, 2014

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Posted on Jan 02, 2017

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SOURCE: Trig Functions and Angles

What is wrong? Are you not getting the right answers? If so, your calculator is set on radian, not degree.

Posted on May 13, 2009

tan(x/2)=sin(x)/(1+cos(x))

Setting x/2=45, means that x=90 (degrees)

But cos(90)=0 and sin(90)=1. Thus tan(45)=1/(1+0)=1.

Setting x/2=45, means that x=90 (degrees)

But cos(90)=0 and sin(90)=1. Thus tan(45)=1/(1+0)=1.

Mar 13, 2013 | SoftMath Algebrator - Algebra Homework...

Press [2nd][MODE] to enter the default setup screen. On the third line Radian, Degree, highlight degree and press ENTER. From then on, angle values will be interpreted as degree values.

Feb 26, 2012 | Texas Instruments TI-86 Calculator

If you have learned about the trigonometric ratios (sine, cosine and tangent) you can use the tangent of the angle.

Let your run be to the right ( along the positive x-axis) and the rise be upwards along the positive y-axis. The tangent of the angle is

tan (theta)=rise/run=7.5/12

If the calculator is set with angle unit in degrees, the angle is obtained as the arc tangent of the (rise/run) value.

theta= arctan(7.5/12)=32.00538321 or about 32 degrees.

The arctan is the inverse of tan. To access it on the calculator press [2nd F][tan]

Depending on the calculator (sorry I do not have your model under my eyes)

Press**[2nd F][tan] ( 7.5/12) [=] **

or

**7.5/12 =** then** [2nd F][tan] [ALPHA][Ans] [=]**

Let your run be to the right ( along the positive x-axis) and the rise be upwards along the positive y-axis. The tangent of the angle is

tan (theta)=rise/run=7.5/12

If the calculator is set with angle unit in degrees, the angle is obtained as the arc tangent of the (rise/run) value.

theta= arctan(7.5/12)=32.00538321 or about 32 degrees.

The arctan is the inverse of tan. To access it on the calculator press [2nd F][tan]

Depending on the calculator (sorry I do not have your model under my eyes)

Press

or

Jan 21, 2012 | Sharp Office Equipment & Supplies

You may want to insist on using the DMS (degree, minute, second) notation but since 20 minutes is 1/3 of a degree the value of the argument of the tangent function is just 36 and 1/3.

**Make sure the angle unit is set to degree**.

**Set the calculator IO mode to MathIO: Press [SHIFT][MODE ][ : Degree]**

Press the[ log] button: log(

Press the [ tan] function key tan (

You see on the screen** log ( tan (**

**Type in 36 [a b/c] 1 [a b/c] 3**

Close the two parentheses ))

Press [EXE]

You should get -0.13344355615

Press the[ log] button: log(

Press the [ tan] function key tan (

You see on the screen

Close the two parentheses ))

Press [EXE]

You should get -0.13344355615

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

To use these functions press the sin, cos, or tan button followed by the angle you are looking for the value for if in degree mode or the radian value your are looking for if in radian mode.

May 12, 2011 | Casio FX-260 Calculator

To find the tangent of an angle:

To find the inverse tangent:

this will give you the angle that yields that tangent value.

You might have to switch your calculator from radian to degrees or from degrees to radians to get the expected result. To do that:

Good luck

- input TAN (it's up one and left one from the division key)
- then the desired angle
- then a close parenthesis
- And then hit ENTER

To find the inverse tangent:

- Press 2nd
- Press TAN (TAN-1)
- Enter the desired tangent value
- close parenthesis
- hit enter

this will give you the angle that yields that tangent value.

You might have to switch your calculator from radian to degrees or from degrees to radians to get the expected result. To do that:

- Press MODE
- Scroll down to where it says ANGLE
- change it from either RAD or DEG

Good luck

Mar 01, 2011 | Texas Instruments TI-83 Plus Calculator

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

There is nothing special about the equation. tan(52) is just another number.

Isolate the unknown to get

X=18*tan(52)

I assume that the angle value is in degrees. To set it, press MODE 0 to use the usual computational mode, then set angle unit to degrees by pressing MODE 4.

Once this is done, type in

52 TAN * 18 =

Isolate the unknown to get

X=18*tan(52)

I assume that the angle value is in degrees. To set it, press MODE 0 to use the usual computational mode, then set angle unit to degrees by pressing MODE 4.

Once this is done, type in

52 TAN * 18 =

Mar 23, 2010 | Casio FX-260 Calculator

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.

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

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.

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

Hope it helps.

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.

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.

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

Hope it helps.

Oct 13, 2009 | Texas Instruments TI-83 Plus Calculator

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