The formula of (cot A - B) is?

Answer:

We know that

Cot (A – B) = 1/ Tan (A- B)

Now Tan (A- B) = (Tan A – TaB B)/(1 + Tan A Tan B)

So,

1/ Tan(A- B) = (1 + Tan A Tan B)/(Tan A- Tan B)

∴ Cot (A- B) = (Cot ACot B + 1) /(Cot B – Cot A)