Question

if a + b equal 45 degree then(cot A -1)(cot B-1) is equal to​

Answer 1

Answer:

0

Step-by-step explanation:

cot(a+b) = (cota*cotb -1)/(cota +cotb)

cot 45⁰ = (cota*cotb -1)/(cota +cotb)

1= (cota*cotb -1)/(cota +cotb)

cota + cotb = cota*cotb -1

cota*cotb -cota -cotb -1 = 0

(cot A -1)(cot B-1) = 0

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