$\int\sqrt{64-t^2}dt$
$4+8\sqrt{4}+5\sqrt{16}-5-6\sqrt{4}$
$( x ^ { 2 } + x - 2 ) ( - x + 3 )$
$-1\:.-8+4-2$
$\left(2a+6\right)-\left(a+6\right)$
$9-36x^2$
$\lim_{x\to\infty}\left(\frac{7x^4-x^3+3}{4x^5+x^2+4}\right)$
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