$\frac{1}{2}\left(2a\:-\:6b+\:8\right)\:$

$\left(8a^3+4a^2b+2ab^2+b^3\right).\left(2a-b\right)$

$3.50+1.50+2.75-5.50$

$\tan\left(\frac{\pi}{4}-\frac{a}{2}\right)-\tan\left(\frac{\pi}{4}+\frac{a}{2}\right)$

$5z^2-2y^2+14+8x^2+9y^3-4z^2-x^2$

$\int\sec^2\frac{4}{5}ydy$

$23\cdot102$