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cosA + cosB – cos(A+B) = 3/2 . Show that A=B=60 degrees. (please give a full solution with all steps)

cosA + cosB – cos(A+B) = 3/2 . Show that A=B=60 degrees. (please give a full solution with all steps)

Grade:11

2 Answers

Saurabh Koranglekar
askIITians Faculty 10341 Points
one year ago
Vikas TU
14149 Points
one year 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
Good Luck 

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