Question : What is the value of $\frac{3 \operatorname{cosec} 42°}{\sec 48°}-\frac{5 \cos 32°}{\sin 58°}$?
Option 1: - 1
Option 2: 5
Option 3: 0
Option 4: - 2
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Correct Answer: - 2
Solution : Given, $\frac{3 \operatorname{cosec} 42°}{\sec 48°}-\frac{5 \cos 32°}{\sin 58°}$ We know, $\operatorname{cosec}\theta = \frac{1}{\sin\theta}$, $\cos(90°-\theta)= \sin\theta$, and $\sec\theta = \frac{1}{cos\theta}$ $\therefore$ Given equation becomes, $\frac{3\cos48°}{\sin 42°}-\frac{5\cos32°}{\sin58°}$ = $\frac{3\cos(90°-42°)}{\sin42°}-\frac{5\cos(90°-58°)}{\sin58°}$ = $\frac{3\sin42°}{\sin 42°}-\frac{5\sin58°}{\sin 58°}$ = 3 - 5 = - 2 Hence, the correct answer is - 2.
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Question : The value of $\frac{1+\sin A}{\cos A}+\frac{\cos A}{1+\sin A}$ is:
Option 1: $2 \sec A$
Option 2: $2 \operatorname{cosec} A$
Option 3: $ \sec A$
Option 4: $ \operatorname{cosec} A$
Question : What is the value of $\sqrt{\frac{\operatorname{cosec} A+1}{\operatorname{cosec} A-1}}+\sqrt{\frac{\operatorname{cosec} A-1}{\operatorname{cosec} A+1}}$?
Option 1: $2 \cos A$
Option 2: $\sec A$
Option 3: $2\cos A$
Option 4: $2 \sec A$
Question : What is the value of the expression: $\sin A(1+\frac{\sin A}{\cos A})+\cos A(1+\frac{\cos A}{\sin A})$?
Option 1: $\sec A+\operatorname{cosec}A$
Option 2: $\sin \mathrm{A}+\cos \mathrm{A}$
Option 3: $\sin \mathrm{A}-\cos \mathrm{A}$
Option 4: $\sec \mathrm{A}-\operatorname{cosec} \mathrm{A}$
Question : The value of $\frac{\operatorname{sin} 58^{\circ}}{\cos 32^{\circ}}+\frac{\sin 55^{\circ} \sec 35^{\circ}}{\tan 5^{\circ} \tan 45^{\circ} \tan 85^{\circ}}$ is equal to:
Option 1: 2
Option 2: 1
Option 4: 3
Question : If $\frac{\sin \theta-\cos \theta}{\sin \theta+\cos \theta}=\frac{4}{5}$, then the value of $\frac{\operatorname{cosec}^2 \theta}{2-\operatorname{cosec}^2 \theta}$ is:
Option 1: $\frac{16}{25}$
Option 2: $\frac{40}{41}$
Option 3: $\frac{41}{40}$
Option 4: $\frac{31}{30}$
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