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Question

if cos θ = 1213 and θ(0,π2], then 144(tan (θ)×sec(θ)]

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Solution

Given, θ(0,π2]
This means θ lies in first quadrant.
cos θ=1213sin θ=1122132sin θ=513tan θ=sin θcos θ=512and sec θ=1cos θ=1312
Also we know,
tan (θ)=tan θ and sec (θ)=sec θ
Thus, tan (θ)×sec(θ)tan θ×sec θ
Substituting values we get,
tan θ×sec θ=512×1312=65144144 tan θ×sec θ=65144×144144 tan θ×sec θ=65

​Hence the correct answer is Option B.


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