$\left(a^2+4\right)\left(a^2-7\right)$
$cos\left(\frac{7\pi}{6}-\frac{\pi}{4}\right)$
$4,42+0,282$
$- 3 ( 2 + 4 k ) + 7 ( 2 k - 1 )$
$7\cdot3+\left(-2\right)$
$-169m^4+49n^2$
$3\left(log\left(x\right)\right)=log\left(6\right)+2\left(log\left(x\right)\right)$
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