1 View

Question : If $\operatorname{cosec} \theta-\cot \theta=\frac{7}{2}$, then the value of $\operatorname{cosec} \theta$ will be:

Option 1: $\frac{49}{28}$

Option 2: $\frac{21}{28}$

Option 3: $\frac{47}{28}$

Option 4: $\frac{53}{28}$


Team Careers360 9th Jan, 2024
Answer (1)
Team Careers360 14th Jan, 2024

Correct Answer: $\frac{53}{28}$


Solution : $\operatorname{cosec}^2 \theta - \cot^2\theta = 1$
⇒$(\operatorname{cosec}\theta+\cot\theta)(\operatorname{cosec}\theta-\cot\theta) = 1$
Given, $\operatorname{cosec} \theta-\cot \theta=\frac{7}{2}$ ..........(i)
⇒$(\operatorname{cosec}\theta+\cot\theta)\frac{7}{2} = 1$
⇒$(\operatorname{cosec}\theta+\cot\theta) = \frac{2}{7}$ ............(ii)
Adding equation (i) and (ii), we get,
$2\operatorname{cosec}\theta = \frac{7}{2} + \frac{2}{7}$
$⇒2\operatorname{cosec}\theta = \frac{49+4}{14}$
$⇒\operatorname{cosec}\theta = \frac{53}{28}$
Hence, the correct answer is $\frac{53}{28}$.

How to crack SSC CHSL

Candidates can download this e-book to give a boost to thier preparation.

Download Now

Know More About

Related Questions

TOEFL ® Registrations 2024
Apply
Accepted by more than 11,000 universities in over 150 countries worldwide
Manipal Online M.Com Admissions
Apply
Apply for Online M.Com from Manipal University
GRE ® Registrations 2024
Apply
Apply for GRE® Test now & save 10% with ApplyShop Gift Card | World's most used Admission Test for Graduate & Professional Schools
View All Application Forms

Download the Careers360 App on your Android phone

Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile

150M+ Students
30,000+ Colleges
500+ Exams
1500+ E-books