AP and TS EAMCET Engineering Model Paper 2

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Question : 50 of 160
 
Marks: +1, -0
If
2‌cos‌A+3‌cos‌B+5‌cos‌C=0=2‌sin‌A+3‌sin‌B+5‌sin‌C
then
8‌cos‌3‌A+27‌cos‌3‌B+125‌cos‌3‌C=k‌cos(A+B+C),
then k=
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