$1-4a^2$
$-r\:+\:4\:-9r$
$c\left(x\right)=0,007x^2+50x$
$\frac{-20}{10}$
$\log\left(2x^4y\right)$
$\left(a+\frac{3}{10}b\right)^2$
$\sin^2225+\cos^2315$
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