If tan A – tan B = x and cot B – cot A = y, then the value of cot (A – B) is

If tan A – tan B = x and cot B – cot A = y, then the value of cot (A – B) is

A

x + y

B

1/x + y

C

x + 1/y

D

1/x + 1/y

Answer:

The correct option is D. 1/x + 1/y

Note