Given-triangle-ABC-what-is-the-maximum-value-of-y-2cosA-cosB-cosC- Tinku Tara June 3, 2023 Trigonometry 0 Comments FacebookTweetPin Question Number 137038 by bobhans last updated on 29/Mar/21 Given triangle ABC, what is the maximum value of y=2cosA + cosB + cosC? Answered by mr W last updated on 29/Mar/21 A=π−(B+C)y=−2cos(B+C)+cosB+cosCduetosymmetry:B=C=xy=−2cos2x+2cosxy=−4cos2x+2+2cosx)y=94−(4cos2x−2cosx+14)y=94−(2cosx−12)2ymax=94whenB=C=x=cos−114 Commented by bobhans last updated on 29/Mar/21 whyBandCsymetrisir Commented by mr W last updated on 29/Mar/21 inthefunctiony=−2cos(B+C)+cosB+cosCyoucanexchangeBandCandthefunctionremainsthesame.whensuchafunctionhasmaximumorminimum,thenB=C. Terms of Service Privacy Policy Contact: info@tinkutara.com FacebookTweetPin Post navigation Previous Previous post: for-what-value-of-k-the-system-of-equation-has-no-solution-x-2y-3z-1-2x-ky-5z-1-3x-4y-7z-1-Next Next post: equation-1-2A-5B-C-29-0-equation-2-9A-6B-C-117-0-equation-3-3A-2B-C-13-0-A-B-C- Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Save my name, email, and website in this browser for the next time I comment.