$16x^4-64$
$\lim_{x\to\frac{\pi}{2}}\left(x+\frac{\pi}{2}\right)\tan\left(x\right)$
$x\frac{dy}{dx}-2=3x^2$
$-140\cdot7$
$4\left(8g\right)$
$\lim_{x\to\infty}\left(\frac{\ln\left(e^t+1\right)}{t}\right)$
$12a^2+6ab-15a^2b^2$
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