$-2.5\left(4r-3\right)$

$12a+3a^2+4a^2b^2+15ab-8a^2b^2-9ab-3a^2b+7ab^2$

$\frac{d}{dx}9\sqrt[3]{x^2}-\frac{6}{\sqrt[3]{x}}$

$\left(-\frac{7}{5}\sqrt{1.451584}-\frac{25}{12}\ln\left(-\frac{3}{25}+\sqrt{1.451584}\right)\right)$

$\left(25\right)\left(8\:-15\right)$

$60,480\:+\:-6,286$

$\lim_{x\to\infty}\left(1+x\right)^{\cot\left(x\right)}$