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d^2/dx^2*y(x) +64y(x) = 0, select all solutions. a) y(x) = C1sin(9x) b) y(x) =9cos(8x) c) y(x)...

d^2/dx^2*y(x) +64y(x) = 0, select all solutions.

a) y(x) = C1sin(9x)

b) y(x) =9cos(8x)

c) y(x) = C2cos(2x)

d) y(x) = 9sin(9x) + 5cos(9x)

e) y(x) = 9cos(2x)

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