$tan45^{\circ}+cos^235^{\circ}+cos^255^{\circ}$

$\frac{\left(\sec\left(b\right)-\cos\left(b\right)\right)}{\cos\left(b\right)}=\tan^2\left(b\right)$

$123bxa+94bxa$

$x^4+24x^2+144$

$2x-6=\frac{3x-3}{3}$

$4.\left(5\right)\:+\:\left(-\:7\right)\:+\:\left(-\:1\right)\:+\:\left(-\:6\right)\:+\:\left(2\right)\:$

$\frac{d}{dx}\sqrt{\frac{x-5}{x^8+4}}$