$\int9\cdot sin\left(x\right)cos\left(x\right)$
$-110-30-50+0$
$\left(\frac{12xy}{7x^4}\right)\cdot\left(\frac{7x^5y^2}{4y}\right)$
$2xy-y+3x;\:x=-3;\:y=2$
$4x\:+\:2\:-\:2x\:+\:6\:+\:6x$
$\frac{\left(2a^{-1}b^2\right)^2}{\left(a^{-3}b\right)^3}$
$\frac{2}{x}<5$
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