$cos\left(-x\right)\frac{sin\left(-x\right)}{cot\left(-x\right)}$
$\lim_{x\to0}\left(\frac{\sqrt{x}}{\sqrt{x+7}}\right)$
$-x^2+3x+2.25$
$\ln\left(\sqrt{\frac{x^2+x-6}{x^2-4}}\right)$
$\frac{90}{1.5}$
$19+16y^2-56y$
$x^2-x+8\ge2x^2-2$
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