2. (10 points) For each equation below, two solutions ry and r2 are given. Does (, 2) form a fundamental solution set? Justify your answer. (a) t"-2tx' + 2r=0, t > 0, (b) " + 4x = 0, 21 = cos(21), 2= cos (t) - 4. (Hint: sin(2t) = 2 sin(t) cos(t), cos(2t) = 2 cos (t)-1)