$\int\frac{6x^2-2x-1}{4x^3-x}dy$

$\frac{\left(2\cdot9\right)^{12}}{\left(9\cdot2\right)^5\cdot2^7}$

$\left(5x^4y^5-6x^2y^4\right)^2$

$2\left(-7z-10\right)$

$\int\:\:sec^6\:acos2\:ad\:a$

$\int\frac{x+3}{\left(x^2-9\right)\left(x^2-1\right)}dx$

$4\left(a-2\right)^2+12\left(a-2\right)\left(a+5\right)+9\left(a+5\right)$