Evaluate the indefinite integral given below.

${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}(5-15x^2)cs{c}^2(x^3-x)dx$

Hint: Recall that the indefinite integral of $cs{c}^2(x)$ is given by

${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}cs{c}^2(x)dx=-cot(x)C$