$2x^2.2x^2$
$4a^2+5b+7a-3b+2a^2$
$4sin^2\left(x\right)=3cos\left(x\right)\:$
$\lim_{x\to0}\sqrt[2]{-5x^3}$
$\left(-3x^{2a-3}y^{5a+1}\right)\left(-2x^{3a+1}y^{4a-6}\right)$
$x-3\cdot3$
$x^2+16xy+64y^2$
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