Derivative of cos x:
*Note that f /(x) denotes the derivative (the slope of the tangent) at (x,f(x)) Using . OR ie. at x = 4; Rules for Obtaining Derivative Functions. 1. Constant Rule If y = c then. 2. Power Rule If y = axn then . Proof of Constant Rule If y = c then. let f(x) = c. Proof of the Power Rule If y = axn then ................
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