Question

Cos-1 (1 - a2/1 + a2) + cos-1 (1 - b2/1 + b2) = 2tan-1 (a + b/1 - ab)

Answer 1

Answer:

Namo buddhay of a couple weeks and 6667766

Step-by-step explanation:

jjjiiru4 and it will not sure why the following