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Given that y1 = cos r is a solution of the differential equation y +3 tan ry' + (3 tan? r + 1)y =

Given that y1 = cos r is a solution of the differential equation y" +3 tan ry' + (3 tan? r + 1)y = 0. Use the reduction of order to find a second linearly independent solution and write the general solution.

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