$\lim_{x\to0}\left(\frac{9-9cos^2\left(x\right)}{x}\right)$
$\frac{2x^3-9x^2+4x+15}{-3x}$
$x-3<7$
$50.654654\cdot2566.656456545454$
$10b\left(1+3a\right)$
$x^2-3x-18$
$24:\left(-6\right)$
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