$\int14x^{-2}dx$

$cos\frac{x}{2}-1=0$

$\int\frac{7x^2+16}{x^4+4x^2}dx$

$\lim_{x\to\frac{\pi}{4}}\left(6\left(\tan\left(x\right)\right)^{\tan\left(2x\right)}\right)$

$\left(\frac{1}{6}x^5\right)\cdot\left(-3x^2\right)\cdot\left(4x^7\right)$

$-4\cdot\left(-63\right)$

$16x-28-21$