The indicated function y1(x) is a solution of the given differential equation. Use reduction of order or formula (5) in section 4.2, instructed to find a second solution y2(x). y'' + 100y = 0; y1 = cos(10x)

The indicated function y1(x) is a solution of the given differential equation. Use reduction of order or formula (5) in section 4.2,
 instructed to find a second solution y2(x).
y'' + 100y = 0;  y1 = cos(10x)

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The indicated function y1(x) is a solution of the given differential equation. Use reduction of order or formula (5) in section 4.2, instructed to find a second solution y2(x). y'' + 100y = 0; y1 = cos(10x)

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