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Questions & Answers
Radian mode does not work properly
-1E-13 is a very small number. When doing this kind of a problem you can regard 1E-13 as 0.
Remember that pi is an irrational number. It is only estimated on your calculator. I just played around with a TI-83 and found the following answers:
cos(pi/2) = 0
cos(2*pi + pi/2) = 0
cos(4*pi + pi/2) = 1E-13
cos(20*pi + pi/2) = -1E-13
As you know, that correct answer to each of these is 0. The calculator gives non-zero answers because some very small errors are accumulating. There is nothing wrong with your calculator.
on Dec 21, 2014
Decimal to mixed number fraction
Isolate the integer part (to the left of the decimal point)
Convert the non integer part (decimal part) into a fraction.
Write the result as (integer part) (fraction part)
Integer part is 1, decimal part is 0.5
0.5 as a fraction is 1/2
3/2= 1 1/2
on Sep 11, 2014
You're 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.
on Jun 07, 2014
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