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**1. Homework Statement**

a.\lim_x -->infty arctan(x^2-x^4) =

b.\lim _x --->pi/2 e^tan (x) =

**2. Homework Equations**

Limit laws

**3. The Attempt at a Solution**

a. I know I can use the limit laws to take the limit of Arctan@infinity=1/2, but then, I don't know if I should factor out the (x^2-x^4)

b. Don't even know.

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