Think of it like a quadratic.
Let A= cos x
12A^2 - A - 6
(3A+2)(4A-3)
Then plug cos x back in for A.
(3cosx +2)(4cosx -3)
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Verified answer
Think of it like a quadratic.
Let A= cos x
12A^2 - A - 6
(3A+2)(4A-3)
Then plug cos x back in for A.
(3cosx +2)(4cosx -3)