1. (2004 National College Entrance Examination - Fujian Paper) $\tan 15^{\circ}+\cot 15^{\circ}$ equals
A. 2
B. $2+\sqrt{3}$
C. 4
D. $\frac{4 \sqrt{3}}{3}$
1. C $\tan 15^{\circ}+\cot 15^{\circ}=\frac{2}{\sin 30^{\circ}}=4$