MATH 55 FINAL EXAM – SPRING 2022
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MATH 55 FINAL EXAM – SPRING 2022
INSTRUCTIONS: Work every problem carefully, clearly, step by step and in order, for FULL CREDIT. All work must be submitted as a SINGLE PDF. Late submissions will not be
graded. Please make sure to submit on time!! MATHEMATICA CAN BE USED only when
doing partial fraction decomposition, solving systems of equations, and general algebraic and trigonometric operations. You CAN NOT use MATHEMATICA to integrate, or solve
differential equations, or take Laplace transforms. Please make sure to write your name, your class, and section number on every page. Every problem has 22 points. The
remaining 2 points to get to a 200 total will be given, if your names (last name, first name) are printed in CAPITAL LETTERS on every page of your work.
1) Determine the singular points of the given differential equation. Classify each singular point as regular or irregular. x3 (x2 — 25)(x — 2)2 y,, + 3x(x — 2)y, + 7(x + 5)y = 0.
Must show all work.
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2) Solve 2x2 y,, — xy, + (x2 + 1)y = 0 about x0 = 0 . Use y = an xn+r . Must show
all work.
3) Use the Integral Definition to find the Laplace Transform of f(t) .
f(t) = 1, 1 < t < 3
Ie(t —3) , t 米 3
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4) Evaluate c {te —3t cosh 3t}. Show every step.
5) Solve y,, — 2y, + 5y = 1 + t, y(0) = 0, y,(0) = 4, using the Laplace Transform
Method. Show all work.
6) Use Laplace Transform to solve f(t) = 1 + t — f(τ — t)3 f(τ)d τ for f(t) .
Show all work.
7) Use Laplace Transform to solve yII + 4yI + 3y = 2 e —τ dτ, yI(0) = y(0) = 0.
Show all work.
8) Use Laplace Transform to solve the given system for x(t) and y(t). Show all work.
y II — x = sint x(0) = — 1, x (0) = — 1, y(0) = 1, y (0) = 0
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9) GivenyI = xy2 — , andy(1) = 1 . Use the Euler’s and RK4 Methods to find a four decimal approximation ofy(1.5) usingh = 0.1 . Provide a table of values for both methods leading to y(1.5) .
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1) Find the FS forf(x) = 2, 0 < x < 2
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2) The Laplace Transform c {e —t2 } exists, but
3) Show that c{tekti }can be used to deduce c {tcoskt }= .
2023-08-14