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Question

If tan θ=12 and tanϕ=13, then the value of θ+ϕ is

A
π6
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B
π
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C
π4
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D
0
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Solution

The correct option is B π4
tanθ=12,tanϕ=13
tan(θ+ϕ)=tanθ+tanϕ1tanθtanϕ
=12+131(12)(13)
=5656
tan(θ+ϕ)=1
θ+ϕ=π4

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