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Unable to solve taylor series

  1. Dec 7, 2011 #1
    I am asked to solve the taylor expansion of sin x around the point -pi/4 to the fourth term.

    I got sin(-pi/4)+cos(-pi/4)(x+pi/4)-.5sin(-pi/4)(x+pi/4)^2-1/6(cos(-pi/4)(x+pi/4)^3 but I am getting it wrong and can't see my mistake.
  2. jcsd
  3. Dec 7, 2011 #2
    Try evaluating for sin(-π/4), cos (-π/4),etc. It appears to be right.
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