$y'=-2cos\left(ax\right)$
$0.6\:x\:1.3$
$49y^2-4y+1$
$b^2+6b+9$
$7n^2\left(n^4-4n^3-n^2+2n+3\right)$
$-11\left(2+21\right)$
$\sqrt{x}+\left(\sqrt{x}+\left(\sqrt{x}\right)\right)$
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