Question

if A+B=315 then (1+cotA)(1+cotB)=​

Answer 1

Answer:

cot (A+B )= cot (315)

cotA × cot B -1 = -cot A - cot B

1 + cot A + cot B + cot A × cot B = 2

so,

(1+ cot A ) ( 1 + cot B) = 2