$\left(j+1\right)cos\left(\left(j+1\right)x\right)$
$5x^2-8x-20$
$6.5\cdot6.5$
$4^8\cdot4^3$
$\sqrt[4]{81y^8}$
$\frac{2x^2+4y^2}{x^2+4y^2}$
$2x-7\ge4x-2$
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