Question : If $\sin \theta+\cos \theta=\frac{\sqrt{3}-1}{2 \sqrt{2}}$, then what is the value of $\tan \theta+\cot \theta$?
Option 1: $8(\sqrt{3}-2)$
Option 2: $12(\sqrt{3}-2)$
Option 3: $12(\sqrt{3}+2)$
Option 4: $8(\sqrt{3}+2)$
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Correct Answer: $8(\sqrt{3}-2)$
Solution : Given, $\sin \theta+\cos \theta=\frac{\sqrt{3}-1}{2 \sqrt{2}}$ Squaring both sides, we get, ⇒ $(\sin \theta+\cos \theta)^2=(\frac{\sqrt{3}-1}{2 \sqrt{2}})^2$ ⇒ $\sin^2\theta+\cos^2\theta+2\sin\theta\cos\theta=\frac{3+1-2\sqrt3}{8}$ ⇒ $1+2\sin\theta\cos\theta=\frac{4-2\sqrt{3}}{8}$ ⇒ $2\sin\theta\cos\theta=\frac{2-\sqrt3}{4}-1$ ⇒ $2\sin\theta\cos\theta=\frac{2-\sqrt3-4}{4}$ ⇒ $\sin\theta\cos\theta=\frac{-2-\sqrt3}{8}$ Now consider, $\tan \theta+\cot \theta$ $=\frac{\sin\theta}{\cos\theta}+\frac{\cos\theta}{\sin\theta}$ $=\frac{\sin^2\theta+\cos^2\theta}{\sin\theta\cos\theta}$ $=\frac{1}{\sin\theta\cos\theta}$ $=\frac{1}{\frac{-2-\sqrt3}{8}}$ $=\frac{-8}{2+\sqrt3}$ Rationalizing it, we get, $=\frac{-8}{2+\sqrt3}\times\frac{2-\sqrt3}{2-\sqrt3}$ $=\frac{-8(2-\sqrt3)}{2^2-(\sqrt3)^2}$ $=\frac{8(\sqrt{3}-2)}{4-3}=8(\sqrt3-2)$ Hence, the correct answer is $8(\sqrt3-2)$.
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