$4a^3b-2a^2b-1;\:a=-2;\:b=3$

$22-\left(-4\right)\cdot\left|6-\left(-3\right)\right|$

$\int\frac{\left(x^3+x\right)\:xd}{x^2+2x-15\:}$

$\left(y+2\right)\left(2y-5\right)$

$\frac{24b^6c^7d}{-8ab^{10}c^3}$

$\lim_{x\to1}\left(\frac{\sqrt[8]{-x^3+x}}{\sqrt[4]{x^2+2x-12}}\right)$

$\sin\left(a\right)=-1$