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- If a functionfis increasing on (a,b) and decreasing on (b,c) , then what can be said about the local extremum offon (a,c) ?Find an example of a function f : [−1,1] → R such that for A := [0,1], the restrictionf |A(x) → 0 as x → 0, but the limit of f(x) as x → 0 does not exist. Show whySuppose that functions g(t) and h(t) are defined for all values of t and g(0) = h(0) = 0. Can limt-->0 (g(t))/(h(t)) exist? If it does exist, must it equal zero? Give reasons for your answers
- Given that the graph of y = f(x) lies between the graphs of y = I(x) and y = u(x) for all x, use the Squeeze Theorem to find lim u(x) = |xl, I(x) = -|x|, f(x) = (1 - cosx)/x x->0Let f : (0, 1) → R be a differentiable function such that |f'(x)| < 1 for all x ∈ (0, 1). For n ≥ 2 let an = f(1/n ). Show that limn→∞ an exists.Find the linearization L(x) of f(x)=tan x at x=3pie/4.
- Let f(x) = 2x2 - 3x - 5. Show that the secant line through (2, f(2)) and (2 + h, f (2 + h)) has slope 2h + 5. Then use this formula to compute: (a) The slope of the secant line through (2, f(2)) and (3, f(3)) (b) The slope of the tangent line at x = 2 (by taking a limit)Let x1 = 2 and let xn+1 = 1/2 *xn + 1/xn. a. Prove that xn is decreasing and bounded from below. Hint: First prove that x^2 n+1 − 2 > 0. b. Determine limn→∞xn.Let fn(x) = nx/1 + nx2 (a) Find the pointwise limit of (fn) for all x ∈ (0,∞).
- 15) Annual U.S. imports from a certain country in the years 1996 through 2005 could be approximated by I(t) = t2 + 3.5t + 48 (1 ≤ t ≤ 9) billion dollars, where t represents time in years since 1995. Annual U.S. exports to the country in the same years could be approximated by E(t) = 0.5t2 − 1.4t + 13 (0 ≤ t ≤ 10) billion dollars. Assuming that the trends shown in the above models continue indefinitely, calculate the limits lim t→+∞ I(t) and lim t→+∞ I(t)/E(t) algebraically. (If an answer does not exist, enter DNE.) lim t→+∞ I(t) = lim t→+∞ I(t) E(t) = Interpret your answers. In the long term, U.S. imports from the other country will (select) (be rounded or rise without bound) and be times U.S. exports to the other country. Could the given models be extrapolated far into the future? Yes or NoProve that if m(x) is differentiable on (−∞,∞) and its derivative m'(x) is bounded then m is Lipschitz continuous on (−∞, ∞).Let E ⊂ R, c a limit point of E, and f, a real-valued function with domain E. Let k ∈ R. Provethat if there exists a δ > 0 such that f(x) > k for all x ∈ E with 0 < |x − c| < δ, and if limx→cf(x) exists, thenlimx→cf(x) ≥ k.