$\left(3a+8xy\right)\left(3a-7x^2y\right)$
$f\left(x\right)=\frac{1}{x}+2\sqrt{x+3}$
$3cos\left(\frac{\pi\:}{2}x\right)=-2$
$\left(-7980\right)-\left(+3590\right)$
$\left(\frac{1}{8}x+\frac{2}{5}\right)^3$
$-27-\left(-29\right)-\left(-28\right)-34$
$3>3x$
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