we took down a note, where the example showed us how to find the exact value of
tan (-5π / 12)
then she wrote down....
tan (-π/4) - tan (π/6)
ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
1+tan(-π/4)tan(π/6)
and then from that, she jumped to the final answer, which is...
(-√3-1) / (-√3-1)
How did she do that?
Maybe I copied down her note wrong, cuz I keep getting a different answer...