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