Question about Texas Instruments TI-89 Calculator

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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 xmax = 10 xscl = 1 ymin = -.173648177667 ymax = 1.73648177667 yscl = 1

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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.

Posted on Jun 03, 2010

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1 Answer

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1 Answer

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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.
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I am trying to graph r=sqroot(sin2theta) on my ti-89 titanium in polar mode and it is telling me when i try to graph that there is an undefined variable. what do i do?


Did you still need help with this? My suspicion is a missing multiplication sign. Sometimes you need to be very explicit in what you want the calculator to do. Have you tried sqroot(sin(2*theta)) explicitly putting the multiplication symbol in there? I think 2theta is interpreted as it's own variable name...

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