`int (x^2(xsec^2x+tanx))/(xtanx+1)^2`

intx^(2)((xsec^(2)x+tanx))/((xtanx+1)^(2))dx=

int xsec^2x tanx dx

If inte^(xsec^(2)x-tanx)(x tanx -(sin2x)/2)dx=e^(f(x)).g(x)+c then which of the following is/are incorrect?

int(sec^2x)/(2+tanx)dx

int xsec^2 x dx

int(tan^2xsec^2x)/(1+tan^6x)dx

int(sec^(2)x)/((1+tanx))dx

int(sec^(2)x)/((1+tanx))dx

int tan xsec^2dx=