$\left(-10\right)\left(-7\right)-\left(-4\right)$
$\left[-15\right]\cdot\frac{1}{\left[-15\right]}$
$12x-3x+9x$
$+27-6\cdot\left(-9\right)$
$1-cos\left(4a\right)$
$\left(\frac{1}{4}x^3+\frac{1}{2}y^2\right)^2$
$\left(3x^2-7x-1\right)\left(-4\right)$
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