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**Prove It** This is exactly the reason why Taylor Polynomials were created. If you think about a calculator, all that it can do is add (and by extension, subtract, multiply, divide and exponentiate). So when programming a calculator to evaluate (say) the sine of any angle, it needs to be programmed with some kind of polynomial (in other words, some combination of addition, subtraction, multiplication, division and exponentiation). I suggest you google "Taylor Series" for more information.