$x^2-6x+9=27$
$2a+4$
$2\cos\left(1\right)^2x-1=0$
$\left(-25\right)-\left(-32\right)-\left(+15\right)$
$\int\frac{4}{cos2x}dx$
$\left(4x+2y+5\right)^2$
$\lim_{x\to-2}\left(5x^3+6x^2+5x-4\right)$
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