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Questions  

If A=cot1tanθtan1tanθ, then tanπ4A2 is equal to

a
cot⁡ θ
b
tan θ
c
tan⁡ θ
d
none of these

detailed solution

Correct option is C

Let tan⁡ θ=tan⁡ α∴A=cot−1⁡(tan⁡α)−tan−1⁡(tan⁡α)=cot−1⁡cot⁡π2−α−tan−1⁡(tan⁡α)=cot−1⁡cot⁡π2−α−tan−1⁡(tan⁡α)=π2−α−α⇒2α=π2−2α or α=π2−A∴tan⁡θ=tan⁡α=tan⁡π4−A2.

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