-Kmath科数- 中考、高考、考验数学题库

(1) $\int _{0}^{1} \dfrac {dx}{1+ \sqrt {1-x^{2}}}= \underline { \quad \quad \quad }$.
(2) $\int _{0}^{1} \dfrac {dx}{x+ \sqrt {1-x^{2}}}= \underline { \quad \quad \quad }$.