$2k-2\le4$

$\sin\left(x\right)\left(\tan\left(x\right)\right)=1+\cos\left(x\right)$

$\frac{dy}{dx}=2x+19$

$\int_e^{\infty}\left(ln\:x\right)dx$

$7x^4+2x^2-9$

$\left(-2\right)\left(-3\right)\left(-3\right)\left(-3\right)\left(-3\right)$

$\int_0^{\infty}\left(\frac{\left(\frac{1}{2}\right)x}{x^2+1}\right)dx$