Grade 12IIT JEE Entrance Exam
In a triangle ABC, Prove that a3cos(B-C)+b3cos(C-A)+c3cos(A-B)=3abc.
In a triangle ABC, Prove that a3cos(B-C)+b3cos(C-A)+c3cos(A-B)=3abc.
1 Answer
avinash
See bro solve and break the value of sin and cos as it is....apply concept of SOT...that`s it.. common solve it
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