$8a-12a-0.75a$
$2e+4e^2$
$\lim_{x\to\infty}\left(\frac{x+e^{2x}}{a+e^{4x}}\right)$
$15x<5x+4$
$15\:+\:93\:+\:15\:+\:78\:+\:-54$
$\frac{1}{cot\:a+\:tan\:a}=sin\:a.cos\:a$
$\left(3x-2\right)\left(x+3\right)$
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