$\frac{1}{\csc^2x\tan\left(x\right)}+\frac{1}{\sec^2x\tan\left(x\right)}$

$-3\left(5p-2\right)$

$\left(yx^{-2}\right)^3\left(2x^3y^{-1}\right)$

$9x^2-30x^2+25y$

$y^2+5y+25$

$-\left(\frac{3}{2}\cdot\:\frac{4}{3}\right)\frac{3}{4}\left(\frac{16}{3}:2\right)$

$4n^2-24$