Question

How do you simplify `(tan 80° + tan 55°)/(1 – tan 80° tan 55°)`?

Answer 1

Simplify trig expression.

Ans: tan 135

Explanation:

Use the trig identity: `tan (a + b) = (tan a + tan b)/(1 - tan a.tan b)`
`(tan 80 + tan 55)/(1 - tan 80.tan 55) = tan (80 + 55) = tan 135^@`