$\int\limits_{}^{}((cos2x)^{2})^{6}(cos2x)dx=\int\limits_{}^{}(1-(sin2x)^{2})^{6}cos2xdx$đătị t = sin2x. rồi áp dụng $\(a+b)^6=$
$\int\limits_{}^{}((cos2x)^{2})^{6}(cos2x)dx=\int\limits_{}^{}(1-(sin2x)^{2})^{6}cos2xdx$đătị t = sin2x
$\int\limits_{}^{}((cos2x)^{2})^{6}(cos2x)dx=\int\limits_{}^{}(1-(sin2x)^{2})^{6}cos2xdx$đătị t = sin2x
. rồi áp dụng $\(a+b)^6=$