Search for: For 0 For 0<x<π the values of x which satisfy the relation 91+|cosx|+cos2x+cos3x+⋯ upto ∞=34 are given by Aπ3,2π3Bπ3,3π4Cπ4,3π4Dπ3,π4 Fill Out the Form for Expert Academic Guidance!l Grade ---Class 1Class 2Class 3Class 4Class 5Class 6Class 7Class 8Class 9Class 10Class 11Class 12 Target Exam JEENEETCBSE +91 Preferred time slot for the call ---9 am10 am11 am12 pm1 pm2 pm3 pm4 pm5 pm6 pm7 pm8pm9 pm10pm Please indicate your interest Live ClassesBooksTest SeriesSelf Learning Language ---EnglishHindiMarathiTamilTeluguMalayalam Are you a Sri Chaitanya student? NoYes Verify OTP Code (required) I agree to the terms and conditions and privacy policy. Solution:Since 0<x<π,−1<cosx<1⇒0≤cos x<1. We can write the given expression as 91/(1−|cosx|)=81=92⇒ 11−|cosx|=2 ⇒ 1−|cosx|=12⇒ |cosx|=1/2 ⇒ cosx=±1/2⇒ x=π/3 or 2π/3 Related content Class 9 Science MCQs CBSE Single Girl Child Scholarship 2024 – Application, Eligibility, Document, & How to Apply Mastering Note-Making for Class 11 Hornbill Chapter 3: A Comprehensive Guide 5 Toughest and Easiest Chapters in CBSE Class 11 Maths Simple Equations for Class 7 Worksheet Government Job Oriented Courses After 10th CBSE Class 10 Board Preparation Tips 2025 Planets Name Diploma Courses After Class 10th Can I Give NDA After Class 11?