Find all solutions of the equation. (Enter your answer in the form a + bπn, where a [0, 2π), b is the smallest possible positive number, and n represents any integer. Round a to four decimal places.)
cot(x)= -1.181

Question

Find all solutions of the equation. (Enter your answer in the form a + bπn, where a [0, 2π), b is the smallest possible positive number, and n represents any integer. Round a to four decimal places.) 
cot(x)= -1.181

dumbcow · Answer

first i would change to tan by taking reciprocal of both sides

tan(x) = 1/-1.181 = -.8467
since tan is neg x must be in either quadrants 2 or 4
so solution is obtained at intervals of pi
use calculator to find inverse tan(-.8467)

arctan(-.8467) = 5.58  (quadrant 4)
subtract pi to obtain solution in quadrant 2
--> 2.439

final solution:
2.439 +pi*n

maram · Answer

the  answer it still wrong

dumbcow · Answer

oh ok, let me check the answer http://www.wolframalpha.com/input/?i=cot%28x%29+%3D+-1.181

dumbcow · Answer

its same as my answer really 
pi - .702 = 2.439

maram · Answer

how about Round a to four decimal places

dumbcow · Answer

so round arctan(-.8467) to 4 decimal places

maram · Answer

thank you