$x^2+5x=4$

$14t^2-15t-11$

$\int\left(x^3+4x\right)\left(x^4+8x^2+2\right)dx$

$\lim_{x\to0}\left(\frac{4x^2-7x}{\left(ln\left(x\right)\right)^2}\right)$

$x^2-12x+16$

$\frac{d}{dx}\left(3\tan\left(x\right)-\sec\left(x\right)\right)$

$\lim_{x\to0}\left(\frac{x^2-2x+\sin\left(x\right)}{x}\right)$