Question about Texas Instruments TI-89 Calculator

# 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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Posted on Jan 02, 2017

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