$10-3\left(\infty\right)$
$\left(-3\right).0\left(-4\right).\left(-5\right)$
$cos\left(\frac{\pi}{2-x}\right)-tan\left(x\right)cot\left(x\right)+cos^2\left(x\right)$
$4x^2+28x+48$
$h+\left(-h\right)$
$\frac{3x-3}{x^2-2x+1}$
$\frac{dy}{dx}\left(2\sqrt{x}+4\sqrt{y}=9y\right)$
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