sin(x/4)=0
sin(x/4)=0 solve in the interval (0,8pi)
\(sin\ \frac{x}{4}=0\)
\(\frac{x}{4}=arcsin\ 0\)
\({\color{blue}x= 4\times arcsin \ 0=4\times 0}\)
\({\color{blue}x= 0}\) !
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