Search for: If cosθ=12x+1x then 12×2+1×2 is equal toIf cosθ=12x+1x then 12x2+1x2 is equal toAsin 2θBcos 2θCtan 2θDNone of these Register to Get Free Mock Test and Study Material +91 Verify OTP Code (required) I agree to the terms and conditions and privacy policy. Solution:Given that, cosθ=12x+1x⇒x+1x=2cosθ----iWe know that,x2+1x2=x+1x2−2=(2cosθ)2−2=4cos2θ−2=2cos2θ∴12x2+1x2=12×2cos2θ=cos2θPost navigationPrevious: Coefficient of variation of two distributions are 50 and 60 and their arithmetic means are 30 and 25 respectively. Difference of their standard deviation is Next: If acos3α+3acosαsin2α=m and asin3α+3acos2αsinα=n then (m+n)2/3+(m−n)2/3 is equal toRelated content NEET Rank Assurance Program | NEET Crash Course 2023 JEE Main 2023 Question Papers with Solutions JEE Main 2024 Syllabus Best Books for JEE Main 2024 JEE Advanced 2024: Exam date, Syllabus, Eligibility Criteria JEE Main 2024: Exam dates, Syllabus, Eligibility Criteria JEE 2024: Exam Date, Syllabus, Eligibility Criteria NCERT Solutions For Class 6 Maths Data Handling Exercise 9.3 JEE Crash Course – JEE Crash Course 2023 NEET Crash Course – NEET Crash Course 2023