Series - Manasquan Public Schools
[Pages:3]Series
Non-Calculator Problems
(1) What are all values of x for which the series x - x2 + x3 - x4 + ... + (-1)n+1 xn + ... converges?
234
n
(a) -1 x 1 (b) -1 x < 1
(c) -1 < x 1
(d) -1 < x < 1
(e)
(2) (-1)n ( )2n = n=0 (2n)!
(a) 1
(b) -1
(c)
(d) 2
(e) e
Calculator Problems
(3) The Maclaurin series for a function f is given by
xn
. What is the value of
f (4) (0) , the fourth
n=0 2n
derivative of f at x = 0 ?
(a) 1
(b) 2
(c) 3
(d) 4
(e) 5
(4) Let f be a function whose seventh derivative is f (7) (x) = 10, 000 cos x . If x = 1 is in the interval
of convergence of the power series for this function, the Taylor polynomial of degree six centered
at x = 0 will approximate f (1) with an error of not more than
(a) 2.45 x 10-5
(b) 1.98 x 10-4
(c) 3.21 x 10-2
(d) 0.248
(e) 1.984
(5) Let f (x) be a function whose Taylor series converges for all x. If f (n) (x) < 1where f (n) (x) is
the nth derivative of f (x) , what is the minimum number of terms of the Taylor series centered
at x = 1 necessary to approximate f (1.2) with an error of less than 0.00001 ?
(a) Three (b) Four
(c) Five
(d) Six
(e) Ten
(6)
What are all values of p for which
1 1 x p
dx
converges?
(a) p > 0
(b)
p
>
1
(c) p > 1
(d) p >
(e) There is no value of p for which the integral converges
(7)
Let
T (x)
=
k =0
1 2
k
(x - 3)k k!
be the Taylor series for a function f. What is the value of
f (10) (3) ,
the tenth derivative of f at x = 3 ?
(a) 5.382 x10-10 (d) 4.883 x10-4
(b) 2.691 x10-10 (e) 1.953 x10-3
(c) 9.766 x10-4
(8)
What
is
the
approximate
value
of
cos
1 2
obtained
by
using
a
fourth-degree
Taylor
Polynomial
for cos x centered at x = 0 ?
(a) 1 - 1 + 1 2 48 3840
(d) 1- 1 + 1 8 64
(b) 1 - 1 + 1 2 24 640
(e) 1- 1 + 1 8 384
(c) 1- 1 + 1 4 16
2005 BC6 2007 BC6 Form B
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