2 x 2 sys. of 1st-order linear diff-EQ w/ given sol'n set

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I really need to know how to do this ASAP, I would give anything fror help on this.

Find a 2 x 2 system of first order linear diff. equations who fundamental solution set is

[cos5x; , [ -sin5x
sin 5x] cos5x]


Thank You!