(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I'm unsure how to even start this problem

Solve for x:

Arctan( -4/5 ) + Arcos (2/SQRT(5) ) = Arctan(x)

2. Relevant equations

3. The attempt at a solution

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# PreCalculs Question

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