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If A+B=45^(@), then prove that (i) (1+ ...

If `A+B=45^(@)`, then prove that `(i) (1+ tan A) (1+ tan B) =2 (ii) (cot A-1) (cot B-1)=2`

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The correct Answer is:
`=(cot AcotB -cot A-cotB)+1=(1)+1=2`
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