Consider the equation y(4) − y = 0. a. Use Abel's formula (Problem 15(d) of Section 4.1) to find the Wronskian of a fundamental set of solutions of the given equation. b. Determine the Wronskian of the solutions et, e−t, cos t, and sin t. c. Determine the Wronskian of the solutions cosh t, sinh t, cos t, and sin t.

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A: