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First - Are you graphing within the proper window? Hit the zoom button and change it to zoom Standard within the graphing window.
Second - Are you inputting the equation correctly? Make sure you are inputting your equations in a y= format. If possible, please reply with a screenshot of your graph screen.
You're probably trying to graph a function that does not involve stat plot features. You can correct this by turning off the stat plot features. Press "2ND" "STAT PLOT" and then select 4:PlotsOff.
You must deactivate the statistical plots. If you do statistical graphs, the graphing is reconfigured in a way that happens to be incompatible with regular fuction graphs.
Put the calculator in radian mode and it will graph trig functions just fine. If you don't know how to change it to radians, then go to mode and cursor over to select radians. I am assuming you know where the sine, cosine, tangent, etc. keys are.
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