1. find the equation of tangent line of f(x) when x = 2 where f(1)=e
and df(x)/dx = 3x^2f(x)
2. consider the function f(x.y) = 16xy-x^4-2y^2 find all relative extrema and
identify and saddle point
3.find the Taylor series of the function x^2/1+x^3 at x=0 and give the
interval of convergence for the series
拜託幫忙解答的朋友能順便加個詳解..因為這方面我理解能力很低，拜託了
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