$\lim_{x\to0}\left(\frac{\left(1+3x\right)^x-1}{\left(1+2x\right)^x-1}\right)$
$25a-40a+16$
$121+22y+y^2$
$2\sqrt{x}\cdot x$
$x^2+7x-144=0$
$4\sin2\left(x\right)+2\sin\left(x\right)\cos\left(x\right)=0$
$\frac{dy}{dx}\:cscx=\frac{-y^{17}}{16}$
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