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Verify that the given functions form a fundamental set of solutions of the differential equation on...

Verify that the given functions form a fundamental set of solutions of the differential equation on the indicated interval. Form the general solution.

1.) y'' − 4y = 0; cosh 2x, sinh 2x, (−∞,∞)

2.) y^(4) + y'' = 0; 1, x, cos x, sin x (−∞,∞)

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