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1/(sin(3x)^2*cos(3x)) canonical form

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        1             
------------------ = 0
            2         
cos(3*x)*sin (3*x)    
$$\frac{1}{\sin^{2}{\left(3 x \right)} \cos{\left(3 x \right)}} = 0$$
1/(sin(3*x)^2*cos(3*x)) = 0