Differentiate the following function. f (x) = 7 x 3 - 6 cos(x) f ' (x) = Attempt: 21x^2 - 6sin(x) Please help me! thank you!
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Originally Posted by miss.strw Differentiate the following function. f (x) = 7 x 3 - 6 cos(x) f ' (x) = Attempt: 21x^2 - 6sin(x) Please help me! thank you! HI you made a sign error Should be 21x^2 + 6 sin x Remember when you differentiate cos , you get - sin .
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