Question: Verify that the function y=cos(2t)+2sin(2t) is a solution to the initial-value problem:y''+4y=0,y(0)=1,y'(0)=4

Verify that the function y=cos(2t)+2sin(2t) is a solution to the initial-value problem:y''+4y=0,y(0)=1,y'(0)=4

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