Saturday

August 2, 2014

August 2, 2014

Posted by **Anonymous** on Friday, August 14, 2009 at 9:21pm.

- MATH -
**MathMate**, Friday, August 14, 2009 at 9:58pmcot(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 10:04pmUse 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.

**Related Questions**

math - determine the exact value of (cot pi/3) + (csc pi/3) / (cos pi/4). how is...

pre-calc - Can someone help me find the exact value of 4csc(3pi/4)-cot(-pi/4)? ...

Math - What is the exact value of cot(5pi/6)?

Math - What is the exact value of cot(5pi/6)?

math repost - 1. What is the exact value of csc^2 210degrees - cot^2 210degrees...

math - Determine the values of sin, cos, tan, csc, sec and cot at (-3, -3) on ...

Math - What is the exact value of csc^2 210degrees - cot^2 210degrees? Can you ...

Math - Let an angle in quad IV such that cos= 2/5 find exact value of csc and ...

math - Without a calculator, find the exact value of csc20° − cot 40° , ...

math - find the exact value of [sec(-30 degrees)- cot 120 degrees]/1-cosec^2(45 ...