$\frac{\left(16a^6b\:^{-3}\right)}{-4a^6b^3}$

$4\left(-3\right)^4-8\left(-3\right)^3+14\left(-3\right)^2+8\left(-3\right)-15\:\:\:\:\:\:\:$

$1.24\:\cdot\:-4.25$

$1-25z^6$

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

$\int\frac{4.x}{\left(x^4-x^2\right)}dx$

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