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Questions  

Suppose α,β>0 and α+2β=π/2 , then tan(α+β)2tanαtanβ is equal to 

 

a
0
b
tan⁡β
c
cot⁡β
d
tan⁡α−cot⁡β

detailed solution

Correct option is A

tan⁡(α+β)=tan⁡(π/2−β)⇒ tan⁡α+tan⁡β1−tan⁡αtan⁡β=cot⁡β⇒ tan⁡α+tan⁡β=cot⁡β−tan⁡α⇒ 2tan⁡α+tan⁡β=cot⁡β=tan⁡(α+β)

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