$3x^2+5y;\:x=1;\:y=2$
$x^4+x^3-19x^2-49x-30$
$2x+y-x-2y$
$-t^{-2}\left(-t^{-2}\right)$
$\frac{dy}{dx}=3\left(y+4\right)^2$
$\frac{dy}{dx}3x^2y=y$
$x^{2}-5x-8$
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