- 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
Prove that: $( 1+cot A-cosecA)( 1+ tan A+secA)=2$
Given: $( 1+cot A-cosecA)( 1+ tan A+secA)=2$
To do: To prove that $L.H.S.=R.H.S.$
Solution:
$L.H.S.=( 1+cot A-cosecA)( 1+ tan A+secA)$
$=( 1+\frac{cosA}{sinA}-\frac{1}{sinA})( 1+\frac{sinA}{cosA}+\frac{1}{cosA})$
$=( \frac{sinA+cosA-1}{sinA})( \frac{cosA+sinA+1}{cosA})$
$=( \frac{( sinA+cosA-1)( sinA+cosA+1)}{sinAcosA})$
$=\frac{( sinA+cosA)^{2}-( 1)^{2}}{sinAcosA}$
$=\frac{sin^{2}A+cos^{2}A+2sinAcosA-1}{sinAcosA}$
$=\frac{1+2sinAcosA-1}{sinAcosA}$
$=\frac{2sinAcosA}{sinAcosA}$
$=2$
$R.H.S.$
Hence proved that $( 1+cot A-cosecA)( 1+ tan A+secA)=2$.
Advertisements
To Continue Learning Please Login
Login with Google