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IfA+B=135find. ,(1+cotA)(1+cotB).??? give me the answer please

IfA+B=135find. ,(1+cotA)(1+cotB).??? give me the answer please

Grade:11

1 Answers

poojitha
42 Points
5 years ago
A+B=135,cot(A+B)=cot135,(cotB-cotA)/(1+cotA.cotB)=-1, 1+cotA.cotB=cotA-cotB ,                                        (1+cotA).(1+cotB)=1+cotA+cotB+cotA.cotB=(1+cotA.cotB)+cotA+cotB=cotA-cotB+cotA+cotB=2cotA

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