$xy=c$
$\int_1^{\infty}\frac{-9x-2}{\left(x+4\right)\left(x^2+1\right)}dx$
$\frac{3}{5}x=1+\frac{2}{3}x$
$\sin2t\cos^2t$
$10\sin x=5$
$\frac{3x^3-\:5ab^2\:-\:6a^2\:b^3\:}{-\:2a}$
$x^2-2x-15>0$
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