$1.25x^2-x$
$\frac{3}{5}x^2-\frac{1}{3}xy-3xz+\frac{8}{3}xz+\frac{5}{2}x^3$
$x^4+225+15x^2$
$48^2$
$sen4r-cos4r=sen2r-cos2r$
$p\left(x\right)=5x^3+11^2-6x+8$
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