- #1
phospho
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Could anyone help me out with this:
Which of the following statements are true and which are false? Justify your answers.
iii) There exists a polynomial P such that [itex] |P(x) - \cos(x)| \leq 10^{-6} [/itex]
I've tried to thinking about it, and it seems as though it is false, because [itex] |cos(x)| \leq 1 [/itex] and the polynomial can go up to an extremely high power so instinctively it can't be true. However, I have no idea on how to prove this (or if it's correct).
I've also tried to look at the expansion of cos(x), leading me to *again* think it's false, but again, I'm not sure how to go about proving it.
Which of the following statements are true and which are false? Justify your answers.
iii) There exists a polynomial P such that [itex] |P(x) - \cos(x)| \leq 10^{-6} [/itex]
I've tried to thinking about it, and it seems as though it is false, because [itex] |cos(x)| \leq 1 [/itex] and the polynomial can go up to an extremely high power so instinctively it can't be true. However, I have no idea on how to prove this (or if it's correct).
I've also tried to look at the expansion of cos(x), leading me to *again* think it's false, but again, I'm not sure how to go about proving it.