Question

Tan15 +Tan 30/1-Tan15. Tan 30 =

Answer 1

tan 15+tan30/1-tan15.tan30

tan(a+b)=(tana+tanb)/(1-tana tanb)

Here a=15andb=30

tan(45)=(tan15+tan30)/(1-tan15.tan30)

And we know tan(45)=1

So,

(tan15+tan30)/(1-tan15

tan30)

=1