$\left(-39\right)-\left(-25\right)$

$\lim\:_{x\to\:\infty\:}\:\frac{x^2}{x^2\:-8x\:+15}\:$

$\frac{2x^55}{x^2+1}$

$0.1y'\left(x\right)+y\left(x\right)=1$

$4x^2-14x+49$

$\left(\sqrt[3]{a}+\sqrt[3]{b}\:\right)\left(\sqrt[3]{a^2}-\sqrt[3]{ab}+\sqrt[3]{b^2}\right)$

$\left(x^4+2x+1\right)\left(2x+3\right)$