$\left(\frac{cos\left(x\right)}{sin\left(x\right)+1}\right)$
$x^3y-y^3$
$2\sqrt{343}$
$x^2-4x-2y+5=0$
$\left(\frac{x}{2}+3\right)^4$
$\frac{x}{2}=-6$
$\sqrt{x=10}$
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