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Ti-89 titanium SIN!!!!!

When i type in sin(75)*16 my answer should be 15.45 but instead i get something else like 4 (square root of 3 + 1)*square root of 2. Im going crazy dont know whats wrong, it also does it for cosine and tangent!!!!!!!!!

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Re: ti-89 titanium SIN!!!!!

The answer that you have received in actuality is correct. However, it is in exact form when the answer that you were looking for was an approximation (decimal form) answer. To achieve this all you have to do is hit the alpha button (the yellow button with a diamond in the center) and then enter which will give you your desired answer :-)

Posted on Jan 15, 2008

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Re: ti-89 titanium SIN!!!!!

Go to the Home screen. Press the MODE key. Scroll through the configuration options. Look for the line Exact/Approximate and change the setting to approximate. Also make sure you angle unit is set to degree.

Posted on Jan 31, 2013

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How do I input into the calculator sin squared 45. The answer is 0.75 but how do I go about it on the calculator?


Sine is the Opposite divided by the Hypotenuse.
Let's use a triangle with both sides equal to 1 and the hypotenuse will be a^2 + b^2 = c^2, or 1^2 + 1^2 = c^2, or c^2 = 2, so c = square root (2).

So in this triangle, the sin 45 degrees is 1/square root 2 or 0.7071.

Sin square 45 is really sin 45 squared. So we get our answer 0.7071 and square it, and we get 0.5.

Good luck.


May 01, 2014 | Sharp el-531x scientific calculator

2 Answers

Why wont my ti-89 integrate

It ts easy to find solution for this problem. Type int(sin(377x-1.231),x,0.299,3.94)
See captured image below


Oct 06, 2012 | Texas Instruments TI-89 Calculator

1 Answer

My TI-89 Titanium won't graph sin, cos, or tan?

Set your calculator to RAD mode and then graphing functions.
See example for y=sin x


Nov 10, 2010 | Texas Instruments TI-89 Calculator

1 Answer

My TI-89 won't solve for sin, cos, or tan. I can type in: sin(127) but instead of an answer it gives me sin(127) again. can someone please tell me how to fix this so that I can do my precalc homework?

Press diamond ENTER to convert the result to numeric form.

To have everything come out numeric, press MODE F2 then down-arrow down to Exact/Approx, then right-arrow and select APPROXIMATE. Press ENTER to set the choice, then ENTER again to save and exit.

Sep 21, 2010 | Texas Instruments TI-89 Calculator

1 Answer

Hi, I recently purchased a ti 89 calculator from a friend and I am having the following problem: The calculator will not evaluate trig functions. For example, if I type Sin(Pie/4) and hit enter, the...

The calculator is set up to produce exact results. If you want the expression to be evaluated put a decimal mark at the end of the 4.
to making 4 a floating point number instead of integer.
Alternatively, press the [MODE] key. Scroll down through the pages of options until you reach the line labeled Exact/Approx. When cursor is on that line, use the right arrow key to open the menu. Select [3:Approximate]. Press [ENTER] to save.

Aug 25, 2010 | Texas Instruments TI-89 Calculator

1 Answer

All trig-based graphs give me weird results on my TI-89 Titanium. Taking y=sin(x) for instance, I get a clean diagonal line through the point (0,0), almost resembling the graph y=x with window xmin = -10...

You have your angular mode set to degrees. Ten degrees is about 0.17 radians, and for small x: sin(x) is nearly equal to x. Thus, sin(x) from -10 to 10 is indeed nearly a straight diagonal line.

Press MODE, then scroll down to "Angle" to change the angular mode.

Jun 03, 2010 | Texas Instruments TI-89 Calculator

2 Answers

"Err: Domain"

I think you may find arcsin(x) is equivalent in older nomenclature to sin^-1 (x) use the "2nd" and the SIN key instead of typing arcsin.
eg. arcsin(0.5) is 30 degrees is the same as sin^-1(0.5)
The ^-1 does not mean reciprocal, but "the angle whose sin is." Here the minus one indicates a kind of inverse operation. The word arcsin indicates that same inverse.

Mar 23, 2009 | Texas Instruments TI-89 Calculator

1 Answer

Need symbolic instead of numeric answer for integration

Clear all variables [F6] [ENTER]
Here is a screen capture of the display for your integral.

Hope it helps

Dec 27, 2008 | Texas Instruments TI-89 Calculator

4 Answers

Cosh Squared or Cubed

if you want to square sin(3), press:


Sep 24, 2007 | Texas Instruments TI-89 Calculator

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