$cot\left(x\right)=-0.414$
$\frac{x}{9}^2-\frac{xy}{3}+\frac{y}{4}^2$
$\lim_{x\to\infty}\left(\frac{cos3x}{x+3}\right)$
$25w^2+20w-4$
$8x^2+7x-x+2$
$70.0848+0.00006+0.000005+0.000005+0.000003$
$a^2+2-7+2a+5$
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