$\left(45-1\right)\left(25+5\right)$
$2^5\cdot2^2$
$10cos\left(x-3\right)=0$
$2\cdot\frac{6}{4}$
$\left(-2.8\right)\left(-0.6\right)$
$3x\cdot x^2-1$
$x^2-7>0$
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