$\frac{dx}{dy}=\frac{y+1}{\sqrt{x}\left(1+\sqrt{y}\right)}$
$x^2+2x-19$
$6\:sin\:4x\:sin\:5x\:$
$2a^2-3a+1$
$\left(3a^6b^{-3}\right)^{-3}$
$3ab+10c-5a-6cb$
$\frac{dy}{dx}\left(y=x^{\frac{7}{x}}\right)$
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