$4^2\:+\:1^3\:$
$\frac{n\left(-1\right)^n}{4^n}\left(x+3\right)^n$
$\frac{3x^3-8x^2+6x+8}{x+4}$
$\frac{x^4-x^2+2}{x+3}$
$\frac{6xy-3x^2}{3x^2-13xy+14y^2}$
$\frac{dy}{du}=\left(1-u\right)\left(u+1\right)^2$
$2\csc2x\cot x=\csc^2x$
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