$\lim_{x\to\infty}\left(tan\left(x\pi\right)\right)$

$5^4\:x\:7^4$

$\int\left(\frac{w}{w^2+9}\right)dw$

$-66+\left(-10\right)\cdot7$

$\lim_{k\to\infty}\left(\frac{\sqrt{k}+\ln\left(k\right)}{k^2+1}\right)$

$x-2<0$

$\frac{dy}{dx}=\frac{\left(2\cdot\:\left(sec\left(2x\right)^2\right)-y\right)}{x}$