Question

A+B=135°, then (1+cotA)(1+cotB)​

Answer 1

Answer:

Step-by-step explanation:

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Answer 2

A+B=135°

cot(A+B)=cot(135°)

cotAcotB-1=-cotA-cotB

1+cotA+cotB+cotAcotB=2

1(1+cotA)+cotB(1+cotA)=2

(1+cotA)(1+cotB)=2