$\left(5x\:+\:15^2\right)$
$\lim_{x\to\infty}\left(\frac{30}{23-2x}\right)$
$\left(2h-4\right)^2$
$\cos a+\sin a\cdot\tan a=\sec a$
$\lim_{t\to3}\left(\frac{t^2-t-2}{t^2-2t-3}\right)$
$15-22.50$
$\ln\left(\frac{5}{4x^3}\right)$
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