$\left(3x^2y-2x^2z\right)^3$

$x^2-2x-15>0$

$\left(5mn-9\right)\left(5mn-8\right)$

$\left(7c^6-10x^2\right)\left(7c^6+10x^2\right)$

$-7-\left(-23\right)$

$\frac{\cos^2\left(x\right)}{1-sin\left(x\right)}-sin\left(x\right)=1$

$\int\left(3cos^5\left(3x\right)\right)dx$