what is the derivative of 6cos(x) - 9cos^3(x)?

2007-12-05 09:20:02 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

f (x) = 6 cos x - 9 (cos x) ³
f `(x) = - 6 sin x - 27 (cos ² x )(- sin x)
f `(x) = - 6 sin x + 27 sin x cos ² x

2007-12-05 09:43:27 · answer #1 · answered by Como 7 · 2⤊ 1⤋

y' = -6sin(x) + 27cos^2(x)sin(x)

2007-12-05 09:23:46 · answer #2 · answered by sahsjing 7 · 2⤊ 0⤋

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