$5\cdot7\cdot8$
$\frac{d^2x}{d^2y}\left(7x^2+2y^2=4\right)$
$4y+6x-2y$
$2x\left(\tan\:^2\left(2x\right)+3\right)+3\:$
$\lim_{x\to0}\left(\frac{hx}{e^{\frac{hx}{kt}}-1}\right)$
$b=\frac{1}{2}\sqrt[3]{a-1}$
$2^4+3^4-4^3$
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