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Question

If α+β=π4 the prove that (1+tanα)(1+tanβ)=2

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Solution

Given: α+β=π4

tan(α+β)=tanπ4

tanα+tanβ1tanαtanβ=1

tanα+tanβ=1tanαtanβ

tanα+tanβ+tanαtanβ=1

tanα+tanβ+tanαtanβ=1 by adding 1 to both sides.

1+tanα+tanβ+tanαtanβ=1+1

(1+tanα)+tanβ(1+tanβ)=1+1

(1+tanα)(1+tanβ)=2

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