$\left(\frac{2}{3}x^2+\frac{3}{2}x\right)^2$

$\left(n^3+2n^2+3\right)\left(n^3-2n^2-3\right)$

$2a-\left(3b-4c\right)-5$

$\left(2x^2-2x+3\right)\left(x^2+5x-7\right)$

$\cot\left(x\right)^4\cdot\csc\left(x\right)^2-\cot\left(x\right)^2\cdot\csc\left(x\right)^2+\csc\left(x\right)^2-1$

$3x^2+1x+16$

$12a^5x-9x^2+9b^3x^3$