Thursday
August 21, 2014

Homework Help: PreCalculus

Posted by Kate on Friday, January 29, 2010 at 4:25pm.

Hi I need some assistance on this problem

find the exact value do not use a calculator

cot[(-5pi)/12]

Here is my attempt

RT = square root
pi = 3.14...

cot[(-5pi)/12]={tan[(-5pi)/12]}^-1={tan[(2pi)/12-(8pi)/12]}^-1={tan[pi/6-(2pi)/3]}^-1={(tan[pi/6]-tan[(2pi)/3])/(1+tan[pi/6]tan[(2pi)/3])}^-1={((RT[3])/3+RT[3])/(1+((RT[3])/3)(-RT3))}^-1

then I got this

(RT[3] + 3RT[3])/3

over

1 - 3/3

as you can see this is a problem
because it leaves me with a denomenator of 0

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

MATH! HELP!!! - I am putting < for the square root abbreviation. I don't know...
Precalculus - What is the square root of 2 to the poweer of (1/3)? In order to ...
Precalculus - Find cot x if sin x cot x csc x = .square root 2 After reducing i ...
College Algebra - I need some help with a handful of questions. I need to see ...
College Algebra - I need some help with a handful of questions. I need to see ...
College Algebra help please - I need some help with a handful of questions. I ...
Algebra - Use the quadratic formula to solve the equation. Give exact answers: ...
Precalculus - PLEASE HELP ME WITH THESE QUESTION AS MUCH AS POSSIBLE!! Evaluate...
trigonometry - Use fundamental Identities to find the exact value of the ...
precalculus - find all solutions of each equations a) cos2x=square root of 3/2 b...

Search
Members