whenever 
radians, where 
could be any integer (
, which includes positive whole numbers, negative whole numbers, and zero.) 
(as in isoscele right triangles) would ensure that 
. Since cotangent is an odd function, 
.
.
(or equivalently, 
.) Therefore, if 
to the input to cotangent would not change the output. In other words:
.
is the only solution to this equation in the period 
, all real solutions to this equation would be in the form 
Find all solutions
for cotx=-1...
Answers: 2
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