Question : If $\cos A=\frac{1}{11}$, then find the value of cot A.
Option 1: $\frac{2 \sqrt{30}}{11}$
Option 2: $2 \sqrt{30}$
Option 3: $\frac{1}{2 \sqrt{30}}$
Option 4: $\frac{11}{2 \sqrt{30}}$
Correct Answer: $\frac{1}{2 \sqrt{30}}$
Solution : Given, $\cos A=\frac{1}{11}$ We know, $\sin^2\theta+\cos^2\theta=1$ ⇒ $\sin^2A+\cos^2A=1$ ⇒ $\sin^2A+\frac{1}{11^2}=1$ ⇒ $\sin^2A=1-\frac{1}{121}$ ⇒ $\sin^2A=\frac{121-1}{121}$ ⇒ $\sin^2 A=\frac{120}{121}$ ⇒ $\sin A=\sqrt{\frac{120}{121}}$ ⇒ $\sin A=\frac{2\sqrt{30}}{11}$ ⇒ $\cot A = \frac{\cos A}{\sin A}$ ⇒ $\cot A = \frac{\frac{1}{11}}{\frac{2\sqrt{30}}{11}}$ ⇒ $\cot A=\frac{1}{2\sqrt{30}}$ Hence, the correct answer is $\frac{1}{2\sqrt{30}}$.
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Question : $7 \sin ^2 A+3 \cos ^2 A=4$, then find $\cot A$:
Option 1: $\sqrt{3}$
Option 2: $\sqrt{2}$
Option 3: $\frac{1}{\sqrt{2}}$
Option 4: $\frac{1}{\sqrt{3}}$
Question : Find the value of $\sqrt{\frac{1-\tan A}{1+\tan A}}$.
Option 1: $\sqrt{\frac{1+\sin 2 A}{\cos 2 A}}$
Option 2: $\sqrt{\frac{1-\sin 2 A}{\cos 2 A}}$
Option 3: $\sqrt{\frac{1+\sin A}{\cos A}}$
Option 4: $\sqrt{\frac{1-\sin A}{\cos A}}$
Question : If $\frac{2 \sin A-\cos A}{\sin A+\cos A}=1$, then find the value of $\cot A$.
Option 1: $1$
Option 2: $\frac{1}{2}$
Option 3: $\frac{1}{3}$
Option 4: $2$
Question : If $\sin A=\frac{\sqrt{3}}{2}, 0<A<90^{\circ}$, then find the value of $2(\operatorname{cosec} A + \cot A)$.
Option 1: $2 \sqrt{3}$
Option 2: $\sqrt{3}$
Option 3: $\frac{2}{\sqrt{3}}$
Question : If $\sin \theta+\cos \theta=\frac{\sqrt{11}}{3}$, then the value of $(\cos \theta-\sin \theta)$ is:
Option 1: $\frac{\sqrt{5}}{3}$
Option 2: $\frac{7}{3}$
Option 3: $\frac{5}{3}$
Option 4: $\frac{\sqrt{7}}{3}$
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