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If sin⁡θ>cos⁡θ, then the value of 1−2sin⁡⁡θcos⁡⁡θ+1+2sin⁡⁡θcos⁡⁡θ2tan⁡⁡θ\frac{\sqrt{1-2\sin⁡ θ \cos ⁡θ}+\sqrt{1+2\sin ⁡θ\cos ⁡θ}}{2\tan⁡ θ}2ta
Question

If sin⁡θ>cos⁡θ, then the value of 12sinθcosθ+1+2sinθcosθ2tanθ\frac{\sqrt{1-2\sin⁡ θ \cos ⁡θ}+\sqrt{1+2\sin ⁡θ\cos ⁡θ}}{2\tan⁡ θ}​ is:

A.

Tan⁡θ

B.

Cot⁡θ

C.

Cos⁡θ

D.

Sin⁡θ

Correct option is C

Given: 

12sinθcosθ+1+2sinθcosθ2tanθ\frac{\sqrt{1-2\sin⁡ θ \cos ⁡θ}+\sqrt{1+2\sin ⁡θ\cos ⁡θ}}{2\tan⁡ θ} 

Formula Used:

sin2θ+cos2θ=1 (a+b)2=a2+b2+2ab (ab)2=a2+b22ab tanθ=sinθcosθ\sin^2 \theta + \cos^2 \theta = 1 \\ \ \\ (a+b)^2 = a^2+b^2+2ab \\ \ \\(a-b)^2 = a^2+b^2-2ab \\ \ \\ \tan \theta = \frac{\sin \theta}{\cos \theta} 

Solution:  

12sinθcosθ+1+2sinθcosθ2tanθ =sin2θ+cos2θ2sinθcosθ+sin2θ+cos2θ+2sinθcosθ2tanθ =(sinθcosθ)2+(sinθ+cosθ)22tanθ =sinθcosθ+sinθ+cosθ2tanθ =2sinθ2tanθ =cosθ\frac{\sqrt{1-2\sin⁡ θ \cos ⁡θ}+\sqrt{1+2\sin ⁡θ\cos ⁡θ}}{2\tan⁡ θ} \\ \ \\ = \frac{\sqrt{\sin^2\theta+\cos^2\theta-2\sin⁡ θ \cos ⁡θ}+\sqrt{\sin^2 \theta +\cos^2 \theta+2\sin ⁡θ\cos ⁡θ}}{2\tan⁡ θ} \\ \ \\ = \frac{\sqrt{(\sin\theta- \cos\theta)^2}+\sqrt{(\sin \theta +\cos \theta)^2}}{2\tan⁡ θ} \\ \ \\ = \frac{\sin\theta- \cos\theta+\sin \theta +\cos \theta}{2\tan⁡ θ}\\ \ \\ = \frac{2\sin\theta}{2\tan⁡ θ} \\ \ \\ = \cos \theta​​

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