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If 
x^(4) <= f(x) <= x^(2) for 
x in 
[-1,1] and 
x^(2) <= f(x) <= x^(4) for 
x < -1 and 
x > 1, at what points 
c do you automatically know 
lim_(x rarr c)f(x) ? What can you say about the value of the limit at these points?

If x4f(x)x2x^{4} \leq f(x) \leq x^{2} for xx in [1,1][-1,1] and x2f(x)x4x^{2} \leq f(x) \leq x^{4} for x < -1 and x > 1, at what points cc do you automatically know limxcf(x)\lim_{x \rightarrow c}f(x) ? What can you say about the value of the limit at these points?

Full solution

Q. If x4f(x)x2x^{4} \leq f(x) \leq x^{2} for xx in [1,1][-1,1] and x2f(x)x4x^{2} \leq f(x) \leq x^{4} for x<1x < -1 and x>1x > 1, at what points cc do you automatically know limxcf(x)\lim_{x \rightarrow c}f(x) ? What can you say about the value of the limit at these points?
  1. Given Inequality: We are given that x4f(x)x2x^{4} \leq f(x) \leq x^{2} for xx in [1,1][-1,1]. This means that as xx approaches any cc within [1,1][-1,1], f(x)f(x) is squeezed between x4x^{4} and x2x^{2}, which both approach c4c^{4} and xx00 respectively.
  2. Squeeze Theorem Application: Since both x4x^{4} and x2x^{2} are continuous functions and they are equal at x=cx = c for any cc in [1,1][-1,1], by the Squeeze Theorem, the limit of f(x)f(x) as xx approaches cc is also c2c^{2}.
  3. Limit Determination: For x < -1 and x > 1, we have x2f(x)x4x^{2} \leq f(x) \leq x^{4}. However, this does not help us determine the limit at any specific point cc because the functions x2x^{2} and x4x^{4} do not approach the same value as xx approaches any cc outside of [1,1][-1,1].
  4. Conclusion: Therefore, we automatically know the limit of f(x)f(x) as xx approaches any cc within the interval [1,1][-1,1], and the value of the limit is c2c^{2}.

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