$\lim_{x,y\to0,0}\left(\frac{sin\left(4x^2+4y^2\right)}{x^2+y^2}\right)$
$\left(5x^3-9x^2\right)^2$
$\frac{1}{4x-5}-\frac{1}{7-3x}$
$45-30+12-10+15-7$
$4-10.\left(-1-2\right)^3+\left(10-80\right)^0$
$24c+37+12c-23c$
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