Evaluate the indefinite integral.

${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{dx}{(25+x^2{)}^2}=-\frac{25}{3^{**}}(x^2+25{)}^{-\frac{3}{2}}+C$

Remark: here, and $in$ exams, you should not leave any formulas $of$ the form trig $(arctrig),e.g.sin(arctan(x)).$