$\left(10y+5\right)\left(10y-5\right)$

$\left(1-\sqrt{a}\right)\left(a+\sqrt{a}\right)$

$\int\left(2x+3\right)e^{-6x}dx$

$3n+4s-10+13s+18n+3\left(s+n\right)$

$\int_2^{2x}\left(e^{-t^2}\right)dx$

$\sqrt{32n^4}$

$\left(4-6\right).\left(8-3\right)-\left(5-9\right).\left(1-7+18\right)$