Question about Texas Instruments TI-89 Calculator

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Hi so i have to use the cos, sin , and tan functions on my ti-89 but when i press enter it says "Error: protected memory violation"... i need to use those keys for a precalc test tomorrow and i dont know what to do

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  • ggckcg Oct 03, 2009

    ok so i did what you said and it said the same thing :/ is there like a special way to write it? lol i just thought you put in sin(the#) and press enter ...

  • ggckcg Oct 06, 2009

    i just want to do simple cos, sin , and tan functions like you could do with a scientific calc.I press 2nd, sin, put a number in, enter. I get the message error: protected memory violation. My calc i think may be messed up but i have to figure this problem out bc it also happens when i put other things into my calc. but i get the illegal operation message and then it freezes and i have to reboot it.

  • ggckcg Oct 09, 2009

    lol i have to push the 2nd key to do sin, cos, or tan and i did everything and it still doesnt work :/ i get the error protected memory violation



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My guess is that you entered as variable of the the functions, the name of a variable that is reserved (system variable, app variable ). In Home screen press [F6: Clean up][ Clear a-z] [ENTER] and stick with x as function argument.
Hope it helps.

Posted on Oct 02, 2009

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  • k24674 Oct 04, 2009

    Please tell me exactly what you are try to calculate, or graph. Describe the key strokes.Some variables are LOCKED system variables, others are Locked apps variables. Here are some system variables. Notice the lock icon to the left.

    To view the variables and their status, use [2nd][VAR-LINK] [F2:View]

    Option 1 allows you to view general variables that have been defined, 2: the variables that belong to the apps, and 3: the system variables of which the first screen displays some. If all fails, reset the RAM.

  • k24674 Oct 04, 2009

    Here are screen shots of numerical calculations with sine and cosine. Notice that if there is a decimal point in a number, the value is given in approximate decimal form. If no decimal point is entered result is exact.

  • k24674 Oct 08, 2009

    Press [2nd][MEM][7:Reset][1:ALL RAM][2:RESET] [ENTER]
    Memory cleared appears on screen.
    If your angles are in degrees you should make sure calculator is configured correctly. Press [MODE] Here is what you see on my calculator.

    Everything in white-on-black has been selected. If you work in radians, screen should be as above. But if you work indegrees, highlight degrees and press [ENTER]

    You said above that you press [2nd] then the function. No. To calculate the trigonometric functions you enter them directly.

    [TAN]35 [)] [ENTER] gives 0.7002075382. Do not forget the closing parenthesis.

    [SIN] 180/3 [)] ENTER gives 0.8660254038. Do not forget )

    [COS] [(-)] 57.065 [)] ENTER . The minus is the change sign next to the enter key. Do not forget the )

    Hope it helps.



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Are you doing some kind of geometry or trying to use the inverse trigonometric functions such as arccos, arcsin, arctan?

If you are doing geometry you should specify what application you are using.

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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 :-)

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

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