We have to solve sin 3x = cos 3x

First divide both sides by cos 3x

=> sin 3x / cos 3x = cos 3x/ cos 3x

=> tan 3x = 1

=> 3x = arc tan 1

=> 3x = pi/4

=> x = pi/12

Also, we know that the tan function is periodic and values repeat after pi radians.

So, x = pi/12 + n*pi

**Therefore x = pi/12 + n*pi.**

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