A point has rectangular coordinates $(10, -18, 35)$ and spherical coordinates $(\rho, \theta, \phi).$  Find $\tan \theta.$
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
A point has rectangular coordinates $(10, -18, 35)$ and spherical coordinates $(\rho, \theta, \phi).$  Find $\tan \theta.$
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
-\frac{9}{5}
A point has rectangular coordinates $(10, -18, 35)$ and spherical coordinates $(\rho, \theta, \phi).$  Find $\tan \theta.$
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