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Question
given that y = (cos^3x)/3 what is dy/dx?
Kristin~
dy/dx is the first derivative of y with respect to x. The derivative of the cos x is -sin x but you have 3x so you need to use the chain rule and multiply by the derivative of 3x as well which is just 3 so combining this info [cos 3x]/3 = (1/3)(3)cos x = cos x
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Sherry Wallin
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I can answer most questions up through Calculus and some in Number Theory and Abstract Algebra.
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I have had my Bachelor's Degree since 1987 and have been a teacher since 1988. I earned my Masters Degree in Mathematics May 2010. I have been teaching at the same community college since 2002.
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