Question

Use an Addition or Subtraction Formula to find the exact value of the expression, as demonstrated in Example 1.

tan 75Á

Answer 1

write tan 75 as tan (30+45)
And,
Use tan (A+B) = tanA+tanB/1−tanAtanB
where A = 30, B=45
tan of 30 is 1/ root 3
tan of 45 is 1