$\int_0^2\left(\frac{x}{x^2+x+1}\right)dx$
$\san\left(1$
$-19\times\left(28-27\right)+15$
$\left(-18\right)\left(-3\right)\left(+1\right)$
$0.25k+1.5-k-3.50$
$sin^2x+sin^2x$
$3^{2x-3}=3^{x+1}$
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