$-3senx=15cosxsenx$
$\lim_{x\to0}\left(\frac{e^x-1}{x^2}\right)$
$\frac{ln\left(x\right)}{\sqrt{y}}\cdot\:\frac{1}{dy}=\frac{x^3ln\left(y\right)}{dx}$
$2sin^2x+3cosx-3=0$
$5x+7=-18$
$\left(2x^2+3x+8\right)\left(3x^2+5x+4\right)$
$x\frac{dy}{dx}-y=-x$
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