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-1+9t-27t^{2}+27t^{3}
Usar teorema binomial \left(a+b\right)^{3}=a^{3}+3a^{2}b+3ab^{2}+b^{3} para expandir \left(-1+3t\right)^{3}.
-1+9t-27t^{2}+27t^{3}
Usar teorema binomial \left(a+b\right)^{3}=a^{3}+3a^{2}b+3ab^{2}+b^{3} para expandir \left(-1+3t\right)^{3}.