Question

cos(1/(3x))=0

Answer 1

\[\cos \left( \frac{ 1 }{3x } \right)=0=\cos n \pi,n \in I,\frac{ 1 }{3x }=n \pi,x=?\]

Answer 2

still lost...

Answer 3

what degree does the input equals to 0
(from 0 to 360)
--> 90 and 270

for \[\frac{ 1 }{ 3x } = 90^{o}\]
the input of x must be...

(same ways for the 270)

(the range of this answer is \[0\le x \le360\] )

to be honest, I'm not quite sure about this one. But I think it's like that
Sorry if it's not right ):

Answer 4

Its okay thank you for trying :)