$\lim_{x\to\infty}15e^{\frac{1}{x}}-15x$
$\frac{\sqrt{185}}{2}=\sqrt{4+\left(7-a\right)^2}$
$6\:sin\:4x\:sin\:5x\:$
$2b^3\sqrt[4]{b}$
$\left(a^4+9\right)^2$
$\lim_{x\to0.9}\left(\frac{x^3-1}{x-1}\right)$
$1=\cot^2x+6\cot x$
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