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don t understant the question.

Calculate the error function for f(x)=tan(x), [-1.25,1.25] for linear, quadratic and cubic shape functions and carry out the calulation using Mathematica or Fortran, C for 10,100 and 1000 elements.

WHat does mean for linear, quadratic and cubic shape functions

It refers to interpolation or means f(x)=tan(x) in 1, 2, u 3 degree

As i understand first i have to replace the function with polinomial in n degree (10, 100 or 1000 by problem specification) and then some how calculate the aproximation

please, help