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In triangle ABC, let a,b,c be the lengths of the sides opposite to the angles A,B,C respectively. Let the value of a3cos3B+3a2bcos(A−2B)+3ab2cos(2A−B)+b3cos3A be l. Then the value of lc3 is equal to

Answer» In triangle ABC, let a,b,c be the lengths of the sides opposite to the angles A,B,C respectively. Let the value of a3cos3B+3a2bcos(A2B)+3ab2cos(2AB)+b3cos3A be l. Then the value of lc3 is equal to


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