Calculate https://webwork.math.su.se/webwork2_...00c416d651.png. The answer may contain roots but not trigonometric functions.

im really bad on the geometry so any1 give me tips?

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- Sep 25th 2012, 05:38 AMPetruscot
Calculate https://webwork.math.su.se/webwork2_...00c416d651.png. The answer may contain roots but not trigonometric functions.

im really bad on the geometry so any1 give me tips? - Sep 25th 2012, 05:48 AMMarkFLRe: cot
Hint: where .

- Sep 25th 2012, 06:01 AMPetrusRe: cot
i want the range 0 ≤ x < 2π, so i have to choose k so it will be on tat range so k= 4 if i got right,sorry kkkeybord broken

- Sep 25th 2012, 06:11 AMMarkFLRe: cot
so you have:

- Sep 25th 2012, 06:24 AMPetrusRe: cot
ty again! but how can ik what cot 5pi/6 is on test

- Sep 25th 2012, 06:29 AMPetrusRe: cot
nvm solved it

cot (5π/6) = 1 / tan (5π/6) = - 1/√3 - Sep 25th 2012, 06:33 AMMarkFLRe: cot

You should know (or be able to quickly find using the unit circle):

If you prefer to use a first quadrant angle, then you may write:

- Sep 25th 2012, 06:37 AMMarkFLRe: cot