$210\cdot x^{19}\cdot\left(-2y\right)$

$\frac{1}{6}\int\left(\cos^4\left(a\right)\right)da$

$t^2\frac{d^2y}{dt^2}+t\frac{dy}{dt}+\left(t^2-\frac{1}{4}\right)y=0$

$x^2-26x+98=-71$

$\lim_{w\to0}\:w^2\left(2w^6-3w^4\right)^{-1}$

$7^3\cdot7^4$

$\int_{\infty}^4\left(\pi e^{2x}\right)dx$