$\frac{d^2}{dx^2}\left(7xy+2y^2=7\right)$
$5\cdot x\cdot log\left(\frac{2}{3}\right)$
$x^2-10x=2$
$\tan^4b-\sec^4$
$\lim_{x\to\infty}\left(\frac{10x^3}{e^{4x}}\right)$
$-7+1-2+1$
$\left(12c-8\right)^2$
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