cosA + cosB – cos(A+B) = 3/2 . Show that A=B=60 degrees. (please give a full solution with all steps)
Kaustubh Nayyar , 10 Years ago
Grade 11
Trigonometry> cosA + cosB – cos(A+B) = 3/2 . Show that ...
2 Answers
Saurabh Koranglekar
Last Activity: 4 Years ago
Dear student
Please find the link attached
https://www.askiitians.com/forums/Trigonometry/cos-a-cos-b-cos-a-b-3-2-show-that-a-b-60_110247.htm
Regards
Vikas TU
Last Activity: 4 Years ago
Dear student
A=B=60
then A=60
B=60
then
cos(A-B)=cosAcosB+sinAsinB
cos(60-60)=cos60cos60+sin60sin60
cos0=cso60cos60+sin60sin60
then A=60
B=60
then
cos(A-B)=cosAcosB+sinAsinB
cos(60-60)=cos60cos60+sin60sin60
cos0=cso60cos60+sin60sin60
Good Luck
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