$f\cdoty=\frac{2x^{2}-x}{x-1}$
$-2\:-\left(-17\right)$
$\frac{\left(sinb+sinc\right)}{\left(2sin\left(\frac{b+c}{2}\right)\right)}-sin\left(\frac{a}{2}\right)$
$2.66^2$
$3-x\ge12$
$2x^4+5x^3-11x^2-20x+12$
$\left(x+2m\right)^3$
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