DU-A_15-16

 If cot2θ(3+1)cotθ+3=0,0<θ<π2, then θ= ? \text { If } \cot ^{2} \theta-(\sqrt{3}+1) \cot \theta+\sqrt{3}=0,0<\theta<\frac{\pi}{2} \text {, then } \theta=\text { ? }

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