$\int_0^{\frac{\pi}{4}}\left(\frac{\left(1+\cos\left(x\right)\right)}{\cos\left(x\right)^2}\right)dx$

$8n\:+\:7\left(8\:-\:10n\right)$

$\left(80-2x\right)\left(50-2x\right)=2000$

$\int\sqrt{xea^3}dx$

$\frac{-12v^7x^6+24vx^6}{3v^4x^5}$

$x ^ { 2 } - 17 x + 30$

$\int\:t\cdot\:\ln\:\left(t+1\right)dt$