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Another second-order equation Consider the differential equation y″(t) + k2y(t) = 0, where k is a positive real number.
a. Verify by substitution that when k = 1, a solution of the equation is y(t) = C1 sin t + C2 cos t. You may assume that this function is the general solution.
b. Verify by substitution that when k = 2, the general solution of the equation is y(t) = C1 sin 2t + C2 cos 2t.
c. Give the general solution of the equation for arbitrary k > 0 and verify your conjecture.
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