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MAST10006 Calculus
Assignment • Answer all the questions below. Of these questions, one will be chosen for marking. • Submit your assignment in Canvas as a single PDF file before the deadline above. See Canvas for instructions on how to submit the assignment. • Marks may be awarded for: ◦ Correct use of appropriate mathematical techniques. ◦ Accuracy and validity of any calculations or algebraic manipulations. ◦ Clear justification or explanation of techniques and rules used. ◦ Clear communication of mathematical ideas through diagrams ◦ Use of correct mathematical notation and terminology. • You must explicitly state the techniques used in your answers when evaluating limits. • You must use methods taught in MAST10006 Calculus 2 to solve the assignment questions. • Give your answers as exact values. 1. (a) Solve the initial valued problem (in R) 3y′′ + 6y′ + 15y = 0, y(0) = 2, y′(0) = 2. (1) (b) Rewrite the solution of (1) under the form y(x) = Cef(x) cos(g(x)) where C is a real number and f(x), g(x) are polynomials of x to be determined by you. (c) Sketch the graph of the solution of (1). 2. (a) Find the general solutions (in R) of the homogeneous ODE: y′′ + 2y′ − 3y = 0 (2) (b) Using your answer to question (2a), find the general solutions (in R) of the inhomo- geneous ODEs: i. y′′ + 2y′ − 3y = 5 cosh(4x) ii. y′′ + 2y′ − 3y = 6ex iii. y′′ + 2y′ − 3y = 3x2 − ex End of assignment