Evaluate the integral using one of the formula choices given below.$636$x$281$dx

$$du$$u$2$a$2=$ln$$u$+$u$2$a$2+$C

$$duu$2$u$2$a$2=$u$2$a$2$a$2$u$+$C

$$du$$a$2+$u$2=$ln$($u$+$a$2+$u$2)+$C

$$a$2$u$2$u$2$du$=$a$2$u$2$u$$sin$1($u$2)+$C