Posted by Ash on Sunday, July 24, 2011 at 6:13pm.
tan(x/3) = 0
x/3 = 0 or x/3 = ±180° or x/3 = ±360° or .....
x = 0 , ±540° , ±1080° ....
or
x = 0, ±3π, ±6π ...
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