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use f(x)=2x^4-4x^2-4 to answer the following. a) find where f(x) is increasing or decreasing b) find...

use f(x)=2x^4-4x^2-4 to answer the following.

a) find where f(x) is increasing or decreasing

b) find where f(x) is concave up or down

c) find the coordinates of all relative extrema

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