$\frac{\left(x+1\right)\left(x-1\right)\left(x^2+1\right)+1}{x^4}$
$5x+7y+11x+3y$
$y\cdot\frac{dy}{dx}=y^2\cdot2x^2$
$1+\left(-4\right)+1$
$\lim_{x\to4}\left(4-x\right)^2$
$x^2.\:2x$
$\frac{dy}{dx}=\frac{4x-senx}{y-2}$
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