Zadanie 1a
Show that S1(n) = n2.
Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 12 zadań z tego arkusza, razem 55 punktów, każde z kluczem i schematem punktowania.
Show that S1(n) = n2.
For n=1,2,3, the values of S2(n) are 1,10,p. (i) State p. (ii) Suppose S2(n) = a1n + a2n2 + a3n3 for rational coefficients a₁,a₂,a₃. Write three linear equations for these coefficients. (iii) Hence determine the coefficients.
Let F(x) = x + x3 + x5 + ⋯ + x2n−1. Show that .
Define and Fq(x) = xFq−1′(x) for q≥1. (i) Show that . (ii) Prove by induction on q that for q≥1. (iii) Write F_q(1) in sigma notation.
For F(x) = x + x3 + ⋯ + x2n−1, use a geometric sum to show that F(x) = x(1 − x2n)/(1 − x2) whenever x≠±1.
Let F(x) = x(1 − x2n)/(1 − x2) for x≠±1 and F1 = xF′. Show that F1(x) = [x + x3 − (2n + 1)x2n+1 + (2n − 1)x2n+3]/(1 − x2)2.
For x≠±1 let F1(x) = [x + x3 − (2n + 1)x2n+1 + (2n − 1)x2n+3]/(1 − x2)2. (i) Show that direct substitution into gives an indeterminate form. (ii) Use l’Hôpital’s rule to prove that the limit is n².
For m=3/2,c=2,h=4, show that .
In the general frustum, the smaller radius is r=c. (i) Give the larger radius R. (ii) Express the slant height l in terms of m,h. (iii) Use the supplied integral to prove A = π(r + R)l.
Now consider , with r>0. Find dy/dx for −r<x<r.
The section for −r/2 ≤ x ≤ r/2 is rotated about the x-axis. Using the supplied integral, show that the curved surface of this spherical belt has area 2πr². Do not include the flat end disks.
Let for −r≤x≤r, with r>0, and let k>0. (i) Describe the transformation from y=f(x) to y=kf(x). (ii) State both x-intercepts of y=kf(x). (iii) Find its derivative for −r<x<r. (iv) The full transformed arc is rotated about the x-axis.…
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