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**[SOLVED] integral problem**

**1. Homework Statement**

hi. my problems an integral which i cant solve. the integral is this-

integral of [1-(e^(t/a))]^2 dt

a is a constant. it came when i tried to find the total power through a LR circuit

**2. Homework Equations**

**3. The Attempt at a Solution**

not sure at all.

[1-(e^(t/a))]^3

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3 [ then???? ]