Question

tanA =cot B prove that A+b=90 degree plz urgent I mark brainlist

Answer 1

tanA=cotB can be written as sinA/cosA=cosB/sinB after cross multiply we get sinA.sinB=cosA.CosB , take it one side we get sinA.sinB-cosA.cosB=0 , we get identity cos(A+B)=0, on comparing , we get A+B=90 , because cos90 is 0