Question about Texas Instruments TI-89 Calculator

I keep putting this in my calculator but its not giving me the right answer what am I doing wrong. 9.6 N (cos) 73 degress

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You should check the units the angles is on (on the calc, it could be in radians or gradians, in ay case you';re getting a wrong answer)

Posted on Sep 03, 2008

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Can yall tell me whats the best way to get the answer i need ok simplify 3x/x+5+x-7

Posted on Aug 27, 2008

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Posted on Jan 02, 2017

Without knowing exactly what you're doing I can't be sure, but I suspect you're entering the 10^9 as something like 1 0 EE 9 .

1 0 EE 9 gives you 10 * 10^9, which is 10^10. You should be doing this as 1 5 0 0 / 1 EE 9 = .

1 0 EE 9 gives you 10 * 10^9, which is 10^10. You should be doing this as 1 5 0 0 / 1 EE 9 = .

Nov 06, 2012 | Texas Instruments TI-30XA Calculator

See angle unit setting below

Aug 16, 2012 | Texas Instruments TI-Nspire Graphic...

5sin(x)+1 = 0 is the equation you want to solve?

so

5sin(x) = -1

sin(x) = -(1/5)

arcsin( sin(x) ) = arcsin( -(1/5) )

x = -.201 (radians)

x = -11.5369 (degrees)

so

5sin(x) = -1

sin(x) = -(1/5)

arcsin( sin(x) ) = arcsin( -(1/5) )

x = -.201 (radians)

x = -11.5369 (degrees)

Jun 04, 2010 | Texas Instruments TI-84 Plus Calculator

By definition

On this calculator, you have two ways to calculate one of these functions. EX cosecant of 37 degrees

- cosecant of X =1/sin(X), must not be confused with arc sine [sin^-1]
- secant of X =1/cos(X), must not be confused with arc cosine [cos^-1]
- cotangent of X =1/tan(X), must not be confused with arc tangent [tan^-1]

On this calculator, you have two ways to calculate one of these functions. EX cosecant of 37 degrees

- You enter 1 / [sin] 37 [ ) ] [ENTER] result is 1.661640141
- 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].

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

You didn't specify what calculator you have.

On my TI30XA, 0.6339869 '2nd' 'COS-1' gives 50.655114

On my Windows XP calculator, 0.6339869 'Inv' 'cos' gives 50.655114

On a Casio FX-300ES, 0.6339869 'Shift' 'cos-1'

I hope one of these helps. If not, let me know what calculator you have and I'll figure it out.

On my TI30XA, 0.6339869 '2nd' 'COS-1' gives 50.655114

On my Windows XP calculator, 0.6339869 'Inv' 'cos' gives 50.655114

On a Casio FX-300ES, 0.6339869 'Shift' 'cos-1'

I hope one of these helps. If not, let me know what calculator you have and I'll figure it out.

Sep 08, 2009 | Office Equipment & Supplies

set it up in correct rig mode, mode button (several times) until you get a window showing deg - rad - grad, choose deg (degree mode)

Nov 19, 2008 | Casio fx-300ES Calculator

instead of putting a whole number put in a decamal.... that worked for me

ex.

cos(25.)

not cos(25)

ex.

cos(25.)

not cos(25)

Oct 25, 2008 | Texas Instruments TI-92 Plus Calculator

go to:

mode

select DEGREE rather than RADIAN three lines down.

mode

select DEGREE rather than RADIAN three lines down.

Aug 20, 2008 | Texas Instruments TI-84 Plus Silver...

-1E-13 is a very small number. When doing this kind of a problem you can regard 1E-13 as 0.

Remember that pi is an irrational number. It is only estimated on your calculator. I just played around with a TI-83 and found the following answers:

cos(pi/2) = 0

cos(2*pi + pi/2) = 0

cos(4*pi + pi/2) = 1E-13

cos(20*pi + pi/2) = -1E-13

As you know, that correct answer to each of these is 0. The calculator gives non-zero answers because some very small errors are accumulating. There is nothing wrong with your calculator.

Remember that pi is an irrational number. It is only estimated on your calculator. I just played around with a TI-83 and found the following answers:

cos(pi/2) = 0

cos(2*pi + pi/2) = 0

cos(4*pi + pi/2) = 1E-13

cos(20*pi + pi/2) = -1E-13

As you know, that correct answer to each of these is 0. The calculator gives non-zero answers because some very small errors are accumulating. There is nothing wrong with your calculator.

Nov 20, 2007 | Texas Instruments TI-83 Plus Calculator

There isn't anything "wrong" with it.

Go to mode, and set the results of your inquiries from Exact to approx.

If you put in cos(e^2), it will print out cos(e^2) because it's the most exact it can be without going into a decimal. (cos(e^2) will be a transcendental number like Pi).

Go to mode, and set the results of your inquiries from Exact to approx.

If you put in cos(e^2), it will print out cos(e^2) because it's the most exact it can be without going into a decimal. (cos(e^2) will be a transcendental number like Pi).

Sep 09, 2007 | Texas Instruments TI-89 Calculator

May 21, 2014 | Texas Instruments TI-89 Calculator

Feb 17, 2014 | Texas Instruments TI-89 Calculator

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