Yadi tanA=cotB proof A+B=90

1.	Yadi tanA=cotB proof A+B=90
Answer» tanA=cotBtanA=1/tanBtanAtanB=1tan(A+B)=tanA+tanB/1-tanATab=tanA+tanB/1-1=tanA+tanB/0tan(A+B)={tex}\\infty{/tex}or tan(A+B)=tan90hence A+B=90

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