Q
quockhanhvietnam


1/ \[I = \int {\dfrac{{2x}}{{x + \sqrt {{x^2} - 1} }}dx} \]
2/ \[I = \int {\dfrac{1}{{x{{(x + 1)}^2}}}dx} \]
3/ \[I = \int {\dfrac{{xdx}}{{\sqrt {1 + {x^2}} \sqrt {1 + \sqrt {1 + {x^2}} } }}dx} \]
2/ \[I = \int {\dfrac{1}{{x{{(x + 1)}^2}}}dx} \]
3/ \[I = \int {\dfrac{{xdx}}{{\sqrt {1 + {x^2}} \sqrt {1 + \sqrt {1 + {x^2}} } }}dx} \]