$\left(2s-3r\right)^4$
$\lim_{x\to0}\left(4x^{5x}\right)$
$\frac { x ^ { 4 } - 1 } { x + x ^ { 2 } }$
$1-m^2$
$3x^2+24x-60$
$f\left(x\right)=\frac{8x^4-4x^3+12x^2}{4x^2}$
$\left(x^2y^2+4\right)^3$
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