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factor completely:?

factor completely:

cos^3 x - 9 cos x

2007-04-06 07:27:38 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

2 answers

=cos x *(cos x-3)*(cos x+3)

2007-04-06 07:47:53 · answer #1 · answered by santmann2002 7 · 0⤊ 0⤋

cos^3 x - 9 cos x
= cos x (cos^2 x - 9)
= cos x (cos x + 3)(cos x -3)

2007-04-06 14:31:37 · answer #2 · answered by sahsjing 7 · 0⤊ 0⤋

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