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Mathematics 9 Online
OpenStudy (anonymous):

f(x)=x^4-4x^2 a. find all points where f has horizontal tangents b. find an equation of the tangent line at x=1 c. find an equation of the normal line at x=1

ganeshie8 (ganeshie8):

start by finding f'(x)

ganeshie8 (ganeshie8):

for part a, solve f'(x) = 0 (cuzhorizontal tangents means derivative = 0)

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