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b multiply the reciprical then factor out 4 on the top and bottom. since this happens to the top and bottom you can cross the 4s out. then you have (t^3-4t-2t^2+8)/12. then you factor the terms and get b.
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b multiply the reciprical then factor out 4 on the top and bottom. since this happens to the top and bottom you can cross the 4s out. then you have (t^3-4t-2t^2+8)/12. then you factor the terms and get b.