$\left(-1\right)\cdot\left(-1\right)\cdot\left(-1\right)\cdot\left(1\right)\cdot\left(-1\right)\cdot\left(-1\right)\cdot\left(-1\right)$
$20+90\:x\:51$
$\frac { 2 + 2 } { 4 }$
$4x^2+10x$
$\lim_{x\to\infty}\left(\frac{3x^2+4}{x^2}\right)$
$\left(-5^2\right)\cdot5^{-3}\cdot\left(-5^5\right)\cdot5^{-4}$
$2\cos^2x+\cos x=1$
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