Zadanie 2h
For this part take , 0 ≤ θ ≤ 2π. The point A on this curve has negative imaginary part and a horizontal tangent. Using 2g, find its θ in [0, 2π].
Find and justify extrema or inflections, distinguish necessary from sufficient conditions, and optimize within a stated domain.
Tę umiejętność sprawdza 69 zadań wzorowanych na arkuszach IB z lat 2022–2026.
For this part take , 0 ≤ θ ≤ 2π. The point A on this curve has negative imaginary part and a horizontal tangent. Using 2g, find its θ in [0, 2π].
Use a graph or another method to find (i) the least material area; (ii) the corresponding radius.
Find A and B.
(i) Show that c=4b and a=12b. (ii) Hence deduce f(x) = 12x/(x2 + 4).
The graph has horizontal tangents at x=3 and at a distinct x=k. (i) Show that c=9. (ii) Find k. (iii) Classify the stationary point at x=k, with justification.
(i) Find A′(θ). (ii) Hence find the maximum opening area.
Sketch y=f(x) for −25≤x≤25, labelling asymptotes, axis intercepts and local extrema.
Now instead suppose f has a vertical asymptote, oblique asymptote y=x−5, and at least one point of zero gradient. Show that b ≥ −9.
Find the maximal domain and range of f.
The curve y = h(x) is defined for real x by . Its local minimum is M(a, b), with a > 1. Find a and b.
For A = 9: (i) Sketch y = F9(x) on −7 ≤ x ≤ 7. (ii) State all its intersections with the horizontal axis. (iii) State the local maximum and local minimum coordinates.
For f(x) = a(x − b)2 + c, where a ≠ 0, you are given and . (i) Solve κ′(x) = 0 to find where the maximum occurs; no maximum test is required.…
For v(x) = 2ln x, x > 0, you are given and . (i) Determine the exact argument where occurs; no maximum test is required. (ii) Show that…
The logarithmic profile used for comparison is v(x) = 2ln x, x > 0. For w(x) = ex/2, , you are given and . (i) Show that…
You may use that , that (a + b + D)/9 is outside [0, a/3], and that xm = (a + b − D)/9 is strictly inside it. Use the second derivative to show that V has a local maximum at x = xm.
You may use that , that (a + b + D)/9 is outside [0, a/3], and that xm = (a + b − D)/9 is strictly inside it. Use (a) and (d) to explain why this local maximum is the largest capacity on the permitted interval.
Let xm denote the interior height maximizing V on [0, a/3]. For the remaining parts, set a = s2 + 2st and b = t2 + 2st, where s,t are positive integers and a<b. Let Vm = xm(a − 3xm)(b − 3xm). (i) Explain why s divisible by 3 guarantees that both xm and…
Find its maximum speed over this interval.
Hence determine the x-coordinate of the point on the curve nearest to A.
Find the coordinates of A.
Sketch the particular solution through (−3, 2) for −4 ≤ x ≤ 4, labelling the coordinates of its local maximum and minimum.
By solving F2′(x) = 0, prove that F₂ has exactly two stationary points on the stated domain, at x = π/2 and x = 3π/2.
The minimum travel time occurs at an interior stationary point. Show that at this point metres.
Find a and b.
Classify the stationary point at x=a, giving a reason.
Is x=c an inflection point of the profile? Explain.
For G, find B and C.
For F, find the two inflection abscissae in terms of m.
For F: (i) state x_B; (ii) find y_B and y_C in terms of m,n.
Find the maximum velocity on the given time interval.
The curve y = (x + 2)/(ax2 + bx + c) has a local minimum at (1,2) and a vertical asymptote x=−1. The real constants a,b,c are nonzero. Find them.
(i) Show that the horizontal-tangent x-coordinates satisfy 2x2 + [ln(2x)]2 − 2xln(2x) − 2x − 1 = 0, with x>0. (ii) Find P and Q.
The exact solution is y=x tan x. (i) Find y at x=π/3 to three significant figures. (ii) Considering the gradient, explain why the forward Euler estimate from π/6 using steps of π/12 is inaccurate here. (iii) Explain why that estimate is less than the exact…
Show that .
The maximizing radius can be written , where p is a positive integer. Find p.
Find the maximum volume in the form , where q is a positive integer.
Over 20≤t≤70, determine the calendar year in which the two capacity predictions differ most.
Find all k>0 for which the curve has a local maximum or minimum.
Sketch f_1, stating the coordinates of its local maximum.
Use calculus to find the minimum of x2 + e2 − ln x for x>0. Justify that it is a minimum.
Hence deduce that x2 + e2 > ln x for all x>0. You may use the minimum value e2 + (1 + ln 2)/2 for their difference.
Give the exact sets of bases for which the graphs have (i) two intersections; (ii) no intersections. You may use the unique contact base a∗ = exp(1/(2e2)).
(i) State the maximizing x_1. (ii) Hence show that the maximum product is 8.
Show that the maximum of g occurs at x=λS for a constant λ independent of S, and determine λ numerically.
Use the continuous maximum to find the largest attainable product for budget 120. Express it as a×10^k, with 1≤a<10 and positive integer k.
Find the point on L nearest to the origin. Use for L.
Find the y-coordinate of R when the triangle area is greatest.
(i) Find dL/dα. (ii) Show that its only stationary angle is π/6.
(i) Hence justify that the stationary length is a minimum. (ii) Find that minimum exactly.
The arms can use at most 7/4 metres of material in total. Is there an angle that meets both projection requirements within this allowance? Justify your answer.
Set a=−4. By varying b systematically or otherwise, find the two b values for which F has a repeated real root.
If F has four distinct x-axis intercepts, state where its local maximum and its two local minima lie relative to the x-axis.
For a<0, show that the stationary points are P = (0, b) and .
Assume a<0 and b>a²/4. For P = (0, b) and : (i) find F″ and classify each stationary point; (ii) state whether these points lie above or below the x-axis.
Assume a>0, so P=(0,b) is the only stationary point. (i) When b>0, state its type and position relative to the x-axis. (ii) For this positive a, state the condition on b placing P below the x-axis.
Find the least value of . You may use the vector (3 − 4p, −p − 6, p2 − 3p).
Find the least value of . You may use the vector (3 − 4p, −p − 6, p2 − 3p).
Now restrict y2 = (x − 1)3 − 4(x − 1) to its right component x≥3. (i) Show that for x>3, . (ii) Hence explain why neither open branch x>3 has a local maximum or minimum.
Let g(x) = (x − r)2[(x − a)2 + b2], b>0, with A=(a,g(a)) and R=(r,0). When a≠r the tangent at A has x-intercept T=((a+r)/2,0). (i) Sketch the curve for a=r=−1 and b=2. (ii) For general a=r, state the coordinates of A and of the curve’s minimum point.
The range is a≤y≤b. Find a,b.
Sketch y=f(x), labelling all asymptotes, local extrema and axis intercepts.
Find their minimum simultaneous separation during the stated interval.
Using P′′ = k2(P − H)(1 − P/N)[1 + (H − 2P)/N], show that the rate of adoption is greatest at P = (N + H)/2, and justify the maximum.
Given that the maximum occurs at P=(N+H)/2, find the maximum dP/dt in terms of k,H,N.
Find the coordinates of A.
The curve x2y2 + y6 = 9x2 is restricted to x>0 and −3<y<3. Show that it has no local maximum or local minimum points.
Consider both real branches of the algebraic curve y2 = x2(9 − 6ln x), with x>0 and y≠0. Its points of zero gradient lie on lines y=mx. Find both values of m.
Find the maximum total area of fabric required, counting both layers of triangle ADC.
(i) Find f′(x). (ii) Hence find all points on the graph where f′(x) = 0, including the endpoints when appropriate.
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