tinh tích phân
1.$\int_{-1}^{1}\frac{\sqrt{1-x^{2}}}{1+2016^{x}}dx$
2.$\int_{-\frac{\pi }{4}}^{\frac{\pi }{4}}\frac{x^{2017}-x^{2015}+x^{2013}-.....-x+1}{cos^{4}x}dx$
3.$\int_{-1}^{1}\frac{dx}{(1+e^{x})(1+x^{2})}$
4.$\int_{\frac{-\pi }{2}}^{\frac{\pi }{2}}\frac{x+cosx}{4-sin^{2}x}dx$
5.$\int_{\frac{-1}{2}}^{\frac{1}{2}}cos2x ln(\frac{1-x}{1+x})dx$
6.$\int_{0}^{2\pi }sin(sinx+nx)dx$
7.$\int_{\frac{-\pi }{2}}^{\frac{\pi }{2}}\frac{sin^{5}x}{\sqrt{1+cosx}}dx$
8.$\int_{0}^{\pi }\frac{xsinx}{1+sin^{2}x}dx$