Question 871096
Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number.
(tan 73° − tan 13°) / (1 + tan 73° tan 13°)
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Identity: tan(x-y)=tanx-tany/1+tanx*tany
(tan 73° − tan 13°) / (1 + tan 73° tan 13°)=tan(73-13)=tan(60)=√3