math 1b, exam #2 1. evaluate (a) (b) - berkeley...
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Math 1B, Exam #2 1. Evaluate (a)
sin 𝑥𝑒!!𝑑𝑥!!
!
(b)
𝑥!!
!𝑒!!𝑑𝑥
(c)
sin! 𝑥 cos! 𝑥𝑑𝑥!!
!
(d)
𝑒!!
𝑒!! − 4𝑑𝑥
!
!
2. Find the length of the curve 𝑦 = !!
!− !" !
!, 2 ≤ 𝑥 ≤ 4.
3. Find the sum: !
!
!!+ !!
!!+⋯ !!!
!!!!!.
4. Converge-‐absolutely-‐conditionally or diverge? (a)
1 − cos1𝑛
∝
!!!
(b)
2 ∙ 4 ∙ 6 ∙ … ∙ 2𝑛1 ∙ 3 ∙ 5 ∙ … ∙ 2𝑛 − 1
!∝
!!!
(c) (−1)!!! 𝑛 + 1 − 𝑛
(d)
1 −2𝑛
!!∝
!!!
5. Find the radius of convergence of
2!(𝑛!)!
2𝑛 ! 𝑥!
!
!!!
6. Show that
cos 1 + 𝑥 − cos 1 1 −𝑥!
2− sin 1 𝑥 −
𝑥!
3!<
115000
for 𝑥 < 0.2 7. Compute the Taylor series for 𝑓 𝑥 = 𝑒!!!𝑑𝑡!
! around 𝑐 = 0. 8. Find the continuous function 𝑓 which satisfies
𝑓 𝑥 = 1 +1𝑥
𝑓 𝑡 𝑑𝑡!
!
9. Solve the differential equations
(a) 𝑥!𝑦! + 𝑥𝑦 = 1 with 𝑦 1 = 2 (b) 𝑥𝑦! = 4 𝑥𝑦 + 𝑦 with 𝑦 1 = 4 (c) 𝑦!! + 2𝑦! + 5𝑦 = 20 cos 𝑥 . Find all solutions.
10. Let 𝑏!!! = 5 + 𝑏! for 𝑛 = 1, 2,… with 𝑏! = 5. Prove that lim!→! 𝑏! exists.