Cant find cotangent with a calculator

[valid dome]

Answer is .67 but I cannot get it for the life of me I am in radian mode

[fluid hamlet]

Well, the problem would be that the answer is not .67

[\cos{\frac{5\pi}{6}} = \frac{-\sqrt{3}}{2}] [\sin{\frac{5\pi}{6}} = \frac{1}{2}] [\cot{\frac{5\pi}{6}} = \frac{\cos{\frac{5\pi}{6}}}{\sin{\frac{5\pi}{6}}} = -\sqrt{3}]

[novel delta]

jstN0body