tích phân

T

trantien.hocmai

$\int_0^1 \dfrac{dx}{x^4+x^2+1}=\int_0^1 \dfrac{dx}{x^4+2x^2+1-x^2} \\
=\int_0^1 \dfrac{dx}{(x^2+1)^2-x^2}=\int_0^1 \dfrac{dx}{(x^2-x+1)(x^2+x+1)}$
 
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