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Suppose that matrices A and B are inverses of matrix C . Is it true that A = B ?
Justify you answer.

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7.

Solve the differential equation y''+ y = 13tan x .

8.

Please find the Laplace transform L[ f(t)] where f(t) = 2 on the interval [a,b]
(where 0 < a < b ) and f(t) = 0 otherwise.

9.

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