2 += cos 3t 3 -- sin 3t 4 3. L 20s? – 103s + 423 6. 28(s – 5)(s? – 9) 20s? – 103s – 423 20s2 + 103s + 423 6. 28(s – 5)(s? + 9) a. d. none of the above 28(s – 5)(s? + 9)

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