- Data Structure
- Networking
- RDBMS
- Operating System
- Java
- MS Excel
- iOS
- HTML
- CSS
- Android
- Python
- C Programming
- C++
- C#
- MongoDB
- MySQL
- Javascript
- PHP
- Physics
- Chemistry
- Biology
- Mathematics
- English
- Economics
- Psychology
- Social Studies
- Fashion Studies
- Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Evaluate each of the following:$ \frac{\tan ^{2} 60^{\circ}+4 \cos ^{2} 45^{\circ}+3 \sec ^{2} 30^{\circ}+5 \cos ^{2} 90^{\circ}}{\operatorname{cosec} 30^{\circ}+\sec 60^{\circ}-\cot ^{2} 30^{\circ}} $
Given:
\( \frac{\tan ^{2} 60^{\circ}+4 \cos ^{2} 45^{\circ}+3 \sec ^{2} 30^{\circ}+5 \cos ^{2} 90^{\circ}}{\operatorname{cosec} 30^{\circ}+\sec 60^{\circ}-\cot ^{2} 30^{\circ}} \)
To do:
We have to evaluate \( \frac{\tan ^{2} 60^{\circ}+4 \cos ^{2} 45^{\circ}+3 \sec ^{2} 30^{\circ}+5 \cos ^{2} 90^{\circ}}{\operatorname{cosec} 30^{\circ}+\sec 60^{\circ}-\cot ^{2} 30^{\circ}} \).
Solution:
We know that,
$tan 60^{\circ}=\sqrt3$
$\cos 45^{\circ}=\frac{1}{\sqrt2}$
$\sec 30^{\circ}=\frac{2}{\sqrt3}$
$\cos 90^{\circ}=0$
$cosec 30^{\circ}=2$
$\sec 60^{\circ}=2$
$\cot 30^{\circ}=\sqrt3$
Therefore,$\frac{\tan ^{2} 60^{\circ}+4 \cos ^{2} 45^{\circ}+3 \sec ^{2} 30^{\circ}+5 \cos ^{2} 90^{\circ}}{\operatorname{cosec} 30^{\circ}+\sec 60^{\circ}-\cot ^{2} 30^{\circ}}=\frac{\left(\sqrt{3}\right)^{2} +4\left(\frac{1}{\sqrt{2}}\right)^{2} +3\left(\frac{2}{\sqrt{3}}\right)^{2} +5( 0)^{2}}{( 2) +( 2) -\left(\sqrt{3}\right)^{2}}$
$=\frac{3+4\left(\frac{1}{2}\right) +3\left(\frac{4}{3}\right) +0}{4-3}$
$=\frac{3+2+4}{1}$
$=9$
Hence, $\frac{\tan ^{2} 60^{\circ}+4 \cos ^{2} 45^{\circ}+3 \sec ^{2} 30^{\circ}+5 \cos ^{2} 90^{\circ}}{\operatorname{cosec} 30^{\circ}+\sec 60^{\circ}-\cot ^{2} 30^{\circ}}=9$.
To Continue Learning Please Login
Login with Google