$-4+10-12-4\left(10-9+8-15\right)-16$
$\cos\left(20\right)-\cos\left(40\right)=0$
$120=x+87$
$100m^2-80my+16y^4$
$\int\frac{5}{x^2+9}dx$
$\frac{x^{-6}}{x^8}$
$\frac{4^4}{4^2}$
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