TI89 Not Displaying Polar Correct Coordinates

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Stefan7
Hello All,

I'm having a problem with my TI89 where it will output correctly if I input an equation of all one type (polar or rectangular), in whatever format I input the equation in. I'm hoping I just somehow messed up the modes when I reset my calculator!

For example if I input (1∠2), output=(1∠2). Similarly if I input (1∠2)(1∠2), output=(1∠4)
If I input 2+3i, output=3i+2 even though I'm in polar coordinate mode. Also if I input (2+3i)>Polar I get 3i+2 out.
Lastly if I input (1∠2)+1i, I get some ridiculous fraction.

Any help is greatly appreciated!
 
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Setting the mode you tell TI - 89 to display results in rectangular or polar form. So, rectangular mode means that the answers will be in ##a + bi## form whether you use polar or rectangular form when entering your expressions. Also, polar mode means that the answers will be in a polar form. You can enter numbers in rectangular or polar form regardless of the setting of display mode.

Now, if you give polar form as input this has to be in the format ##(r < \theta)## where the angle ##\theta## must be in degrees or radians depending on calculator mode.
 
QuantumQuest said:
Setting the mode you tell TI - 89 to display results in rectangular or polar form. So, rectangular mode means that the answers will be in ##a + bi## form whether you use polar or rectangular form when entering your expressions. Also, polar mode means that the answers will be in a polar form. You can enter numbers in rectangular or polar form regardless of the setting of display mode.

Now, if you give polar form as input this has to be in the format ##(r < \theta)## where the angle ##\theta## must be in degrees or radians depending on calculator mode.

Hi Quantum Quest,

Thank you for your response! I know what you are saying, but this isn't happening (my description may have been too vague). I'm in polar mode the whole time, but my calculator is only outputting in polar mode IF I input the equation entirely in polar mode, otherwise it outputs in another format. Please see linked images https://www.dropbox.com/sh/tp09xo3y2bvbj20/AABDHLfNokbkJTspbk4t843Na?dl=0.

Thanks!
 
Stefan7 said:
I'm in polar mode the whole time, but my calculator is only outputting in polar mode IF I input the equation entirely in polar mode, otherwise it outputs in another format.

Do you set polar mode and save or convert to polar mode afterwards? In any case be careful to use the appropriate parentheses in the input. If your calculator has not been damaged or modified in some way you should have polar output regardless of the type of input.