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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 |
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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(A−2B)+3ab2cos(2A−B)+b3cos3A be l. Then the value of lc3 is equal to |
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