The devariate of a functions of f at x is given by f'(x)=lim_(h->0)(f(x+h)-f(h))/(h) Use the definition of the derivative to find the derivative of f(x)=8x^2+9x+1 Enter the fully simplified expression for f(x+h)-f(x).

Find the local maximum and minimum values and saddle points of the function. If you have three-dimensional graphing software, graph the function with a domain and viewpoint that reveal all the important aspects of the function
$f(x,y)=x^3-6xy+8y^3$

$\frac{1}{\sec <!--\; \; -->(x)}$ in derivative?

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