Sum and Difference Formulas

Question

Express the following as a function of a single angle.

tan145°+tan85°/1-tan145°tan85°

Answer 1

I think that you meant this

(tan 145 + tan 85) / [ 1 - (tan 145 * tan 85) ]

If so, then the answer is

tan (145 + 85) = tan 225 = 1