$\left(v-7\right)^2$

$\left(5-2g\right)\left(1+3g\right)$

$3x^5+6x^5+7x^5$

$4+\sqrt{2k^2-5k+1=2+\sqrt{k^2-2k+1}}$

$\left(\frac{30x^3-18x^2}{6x^3+5x^2}\right)\left(\frac{42x+35}{60x-36}\right)$

$\int e^{-2x}\cdot\cos\left(nx\right)dx$

$\frac{y^2}{y-3}\cdot\frac{-1}{\left(y+2\right)}$