O
ovan


[tex]\int\limits_{0}^{\pi/3}\frac{1+xsinx}{cos^2x}dx[/tex]
[tex]\int\limits_{0}^{\pi/3}\frac{xsin^2x}{sin2xcos^2x}dx[/tex]
[tex]\int\limits_{0}^{\pi}\frac{xsinx}{1+cos^2x}dx[/tex]
[tex]\int\limits_{0}^{\pi/3}\frac{xsin^2x}{sin2xcos^2x}dx[/tex]
[tex]\int\limits_{0}^{\pi}\frac{xsinx}{1+cos^2x}dx[/tex]