Evaluate the integral by making the given substitution. (use c for the constant of integration.) sec2(1/x9) x10 dx, u = 1/x9

Answer is    ======i assume this is what this is what question asks for as it makes the substitution work:     if      then by simple differentiation, we have    note that    therefore, performing these substitutions:    

21, i'm pretty sure it's right lol

The right answer should be 6 but your not very specific