

Tính tích phân:
a/ [tex]\int_{0}^{\frac{\Pi }{6}}\left ( 1-cos3x \right )sin3x.dx[/tex]
b/ [tex]\int_{0}^{\sqrt{3}}\frac{4x}{\sqrt{x^{2}+1}}dx[/tex]
a/ [tex]\int_{0}^{\frac{\Pi }{6}}\left ( 1-cos3x \right )sin3x.dx[/tex]
b/ [tex]\int_{0}^{\sqrt{3}}\frac{4x}{\sqrt{x^{2}+1}}dx[/tex]