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Q.

If 3sin⁡ β=sin⁡(2α+β), then tan⁡(α+β)−2tan⁡ α is

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a

independent of α

b

independent of β

c

dependent of both α and β

d

independent of both α and β

answer is A.

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Detailed Solution

3sin⁡ β=sin⁡(2α+β),tan⁡(α+β)−2tan⁡α=tan⁡(α+β)−tan⁡α−tan⁡α=sin⁡(α+β)cos⁡(α+β)−sin⁡αcos⁡α−tan⁡α=sin⁡(α+β−α)cos⁡αcos⁡(α+β)−tan⁡α=sin⁡βcos⁡(α+β)cos⁡α−sin⁡αcos⁡α=sin⁡β−sin⁡αcos⁡(α+β)cos⁡(α+β)cos⁡α=2sin⁡β−[sin⁡(2α+β)−sin⁡β]2cos⁡(α+β)cos⁡α=−[sin⁡(2α+β)−3sin⁡β]2cos⁡(α+β)cos⁡α=0
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