Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
93 views
in Mathematics by (35.1k points)
closed by

सिद्ध करें कि 4(cot-13 + cosec-1√5) = π.

2 Answers

+2 votes
by (36.2k points)
selected by
 
Best answer

बायाँ पक्ष = \(4(\cot^{-1}3 + \text{cosec}^{-1} \sqrt 5)\)

\(= 4\left(\tan^{-1}\frac13 + \sin^{-1} \frac 1{\sqrt 5}\right)\)

\(= 4\left(\tan^{-1}\frac13 + \tan^{-1} \frac 1{2}\right)\)

\(= 4\left[\tan^{-1}\left(\cfrac{\frac13 + \frac 12}{1 - \frac13 \times \frac 12}\right)\right]\)    \(\left[\because \tan^{-1}x + \tan^{-1}y = \tan^{-1}\left(\frac{x + y}{1-xy}\right)\right]\)

\(= 4\left[\tan^{-1} \left( \cfrac{\frac 56}{\frac 56}\right) \right]\)

\(= 4\left[\tan^{-1} 1 \right]\)

\(= 4\left(\tan^{-1} \tan\frac \pi 4\right)\)

\(= 4 \times \frac \pi 4\)

\(= \pi\)

= दायाँ पक्ष सिद्ध हुआ।

+2 votes
by (75 points)

the ans is mentioned below

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...