Question 1205809
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Rewrite each expression as a function of a single angle. 
You do not need to solve for the function at that angle.
{{{(tan(28^o) + tan(77^o))(1 - tan(28^o)*tan(77^o))}}}
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<pre>
Use the formula of adding arguments for tangent function

    tan(a+b) = {{{(tan(a) + tan(b))/(1-tan(a)*tan(b))}}}


and get

  {{{(tan(28^o)+tan(77^o))(1-tan(28^o)*tan(77^o))}}} = tan(28°+77°) = tan(105°).    <U>ANSWER</U>


The last expression is what you want to get.
</pre>

Solved.