$4n+5=33$
$\frac{\left(cos^2x\:-\:2cosx\:+\:1\right)}{sin^2x}=\frac{\left(1-cosx\right)}{1+cosx}$
$\frac{dy}{dx}=2x-5y$
$6^3+y^6$
$-4x^2+9x-2$
$\int\frac{x^2}{\sqrt{100x^2+64}}dx$
$11x-23<-3+6x$
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