Question 1125836
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1.  arctan(1) = {{{pi/4}}}.


2.  Therefore, the given equation takes the form


    arctan(x) + {{2*(pi/4)}}} = {{{3pi/4}}},    or


    arctan(x) = {{{3pi/4}}} - {{{2*(pi/4)}}} = {{{pi/4}}}.


3.  Therefore,  x = {{{pi/4}}}.
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<U>Answer</U>.  &nbsp;&nbsp;Option &nbsp;d.