$\frac{d}{dx}y=x^{4\cos\left(x\right)}$
$\frac{\sqrt{a}}{1+\sqrt{a}}$
$3+27y$
$4ysec\left(7y\right)=-21y$
$y=x+6,\:y=x^3,\:2y\:+x=0$
$4y-3+2y+8$
$-\left(+2-4\right)+\left(-5-3-2\right)-\left(-8+10\right)$
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