Giá trị của tích phân $I=\int\limits_{1}^{2}{{\frac{{1-{{x}^{2}}}}{{1+{{x}^{4}}}}dx}}$ bằng?
A. $\frac{{\sqrt{2}}}{2}(\arctan \frac{5}{2}-\arctan 2).$
B. $\displaystyle \arctan \frac{5}{2}-\arctan 2.$
C. $\frac{{\sqrt{2}}}{2}(\arctan \frac{5}{2}+\arctan 2).$
D. $\displaystyle \arctan \frac{5}{2}+\arctan 2.$
A. $\frac{{\sqrt{2}}}{2}(\arctan \frac{5}{2}-\arctan 2).$
B. $\displaystyle \arctan \frac{5}{2}-\arctan 2.$
C. $\frac{{\sqrt{2}}}{2}(\arctan \frac{5}{2}+\arctan 2).$
D. $\displaystyle \arctan \frac{5}{2}+\arctan 2.$
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Hóa Học lớp 12
