Posted by Anonymous on Friday, August 14, 2009 at 9:21pm.
What is the exact value of cot(5(pi)/6)?

MATH  MathMate, Friday, August 14, 2009 at 9:58pm
cot(5π/6)
= cos(5π/6) / sin(5π/6)
= sin(π/2  5π/6)/ cos(π/2  5π/6)
= sin(π/3)/cos(π/3)
= sin(π/3)/cos(π/3)
= (sqrt(3)/2)/(1/2)
= sqrt(3)

MATH  drwls, Friday, August 14, 2009 at 10:04pm
Use Google, if you don't have a calculator. Type
tan(5*pi/6) =
in the search box.
Then take the reciprocal of that answer, for the cotangtent.
You may recognize the answer as the square root of 3.
5 pi/6 is a 150 degree angle. The reference angle is 30 degrees, but cosine is negative in the second quadrant.
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