Question 1114645
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It is a quadratic equation relative tan(x).


To solve it,  factor the left side


(tan(x)-5)*(tan(x)+6) = 0.


The solutions in the given interval are 


    x = atan(5),        x = atan(5) + pi,


    x = -atan(6) + pi,  x = -atan(6) + 2*pi.


(four solutions, in all).
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