Question

tan(A-B) = tanA-TanB/1+tanAtanB​

Answer 1

tan(45-30)= tan45-tan30/1+tan45.tan30

tan15= (1-1/√3)/(1+1/√3) = (√3-1)/(√3+1)

or. Rationalising

= (√3-1)^2/2

= (4-2√3)/2

= 2-√3