$\ln x=42$
$\left(3x^2y^3+y^4\right)dx+\left(3x^3y^2+y^4+4xy^3\right)dy=0$
$\frac{dy}{dx}4x\sqrt[3]{y}+6y=22$
$\int sec^{13}\left(2x\right)dx$
$a+9+10a$
$\frac{x}{x+1}+\frac{7x+9}{x^2-1}$
$7+9c+5$
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