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April 1st, 2012, 05:51 PM  #1 
Newbie Joined: Apr 2012 Posts: 3 Thanks: 0  Factoring and calculator issues
hey everyone, i have a calc 2 test coming up on taylor polynomials and power series. when i type in the convergence points in the original equations, i sometimes have to input (1)^"variable" for some reason, the calculator spits out an answer with sin and cosines that take up the entire screen. for example, (1)^x*(1)^x puts out 2COS(180X)^21+2SIN*(180X)...blablabla...i tried every combination of settings but it still gives me the same BS answer. i know this is simple algebra, but some equations are super long and i want to use the calc to do it for me. does anyone have any idea why this is happening? thanks! 
April 1st, 2012, 05:59 PM  #2 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,963 Thanks: 1148 Math Focus: Elementary mathematics and beyond  Re: Factoring and calculator issues
What calculator are you using?

April 1st, 2012, 06:51 PM  #3 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: Factoring and calculator issues
Presumably when you give it (1)^x it gives you a series expansion for the expression in terms of x about 0: (1)^x = exp(x log 1) = 1 + (x log 1) + (x log 1)^2/2 + ...; judging from the 180s, it's probably in degree mode rather than radian mode.

April 2nd, 2012, 05:19 AM  #4 
Newbie Joined: Apr 2012 Posts: 3 Thanks: 0  Re: Factoring and calculator issues
i have a TI Nspire CX CAS. i tried changing to radians, but it just changed to 2cos(n*pi^2)1+2sin(n*pi)...etc.. i know this is a very simple problem, i'm just trying to figure out why the calc is making such a big issue out of it hehe.

April 2nd, 2012, 05:28 AM  #5 
Newbie Joined: Apr 2012 Posts: 3 Thanks: 0  Re: Factoring and calculator issues
and i never entered it as a series, just (1)^x*(1)^x thanks! 
April 2nd, 2012, 08:45 AM  #6  
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: Factoring and calculator issues Quote:
 

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