If cos3A = X, then value of X? – McqOptions

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1.	If cos3A = X, then value of X?
A.	4cos3AÂ -Â 3cosA
B.	4cos3AÂ +Â 3cosA
C.	3cosAÂ -Â 4cos3A
D.	cosAÂ +Â 4cos3A
Answer» B. 4cos3AÂ +Â 3cosA

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