$\frac{-3x^6y^3}{15x^2y^2}$
$-2\left(-1\right)^3+\left(-1\right)^2-3\left(-1\right)+7$
$\lim_{x\to o}\left(cot5xsin10x\right)$
$\left(2+f^2\right)^2$
$\sqrt{12x}+\sqrt{27x}+\sqrt{48x}$
$56+820+50$
$cos\left(2x\right)-2\cdot\:\:cos^2\left(\frac{x}{2}\right)=1$
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