$10cosb+6=4cosb+4$
$10x>0$
$ax=n$
$2\:a^2b\:c^3\:y;\:a=2,\:b=3,c=1$
$25x^2-20x$
$4\sqrt[3]{108x^4}-\sqrt[3]{32x^4}$
$\sec\left(u\right)-\tan\left(u\right)=\frac{\cos\left(u\right)}{1-\sin\left(u\right)}$
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