=+4. The roots of Problem (P4.1.a) can be obtained for example by plotting the functions: f1(????) =

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=+4. The roots of Problem (P4.1.a) can be obtained for example by plotting the functions:

f1(????) = ???????? and f2(????) = 1 + cos ???? cosh ????

−cosh ???? sin ???? + cos ???? sinh ????

(P4.1.j)

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