$\:k\:6\:+\:h\:6$
$\left(\frac{7}{5}x^2+\frac{1}{8}\right)\left(-\frac{7}{5}x^2-\frac{1}{6}\right)$
$\left(3^3\right)\left(4^0\right)^2\left(3\cdot2\right)^{-3}\left(2^2\right)$
$x^2+2x\le0$
$2\left(2x\right)\left(-6\right)$
$\lim_{x\to0}\left(\frac{cos\left(x+a\right)-cos\left(x-a\right)}{x}\right)$
$\left(7x^3+4y^2\right)\left(7x^2-4y^2\right)$
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