Find relation between x and y.cosx+cosy-cos(x+y)=3/2.
Shreya Rajpal , 10 Years ago
Grade 11
Magical Mathematics[Interesting Approach]> Find relation between x and y. cosx+cosy-...
1 AnswersArun Kumar
Last Activity: 10 Years ago
Hello Student,
cosx+cosy-cos(x+y)=3/2
2cos((x+y)/2)cos((x-y)/2)-2[cos((x+y)/2))]^2-0.5=0
=>2ka-2k^2-0.5=0
=>D=4a^2-4>=0
=>a=1 since its a cos(x-y) whose value is in [-1,1]
so x=y
You got what you asked for.
Thanks & Regards
Arun Kumar
Btech, IIT Delhi
Askiitians Faculty
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