MCQ
cos 3A बराबर हैं-
  • A
    $3 \cos A 4 \cos ^3 \mathrm{~A}$
  • B
    $3 \cos A+4 \cos ^3 A$
  • $4 \cos ^3 \mathrm{~A}-3 \cos \mathrm{A}$
  • D
    इनमें से कोई नहीं

Answer

Correct option: C.
$4 \cos ^3 \mathrm{~A}-3 \cos \mathrm{A}$
(C) $4 \cos ^3 \mathrm{~A}-3 \cos \mathrm{A}$

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