$56^2-49^2$
$h\left(z\right)=\left(7-z^2\right)\left(z^3-4z+2\right)$
$\left(3x-2y+9\right)\left(7y-10-6x\right)\left(4x+3y\right)$
$36,45\:+\:50$
$9h^2-9h^2+8h^2$
$x^2\:+10\:\:\:\:\:x\:=\:-4$
$\left(1-t^2\right)x'+4tx=t$
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