$2.50\cdot9$
$\left(0.05a+4b\right)$
$x+3xy^3-6x-2x+8xy^3+y-2x^4y$
$f\left(x\right)=\left(x^2-4x\right)^x\:\left(2x\right)^2$
$\left(4y-2\right)^2$
$\cos\left(x-\frac{\pi}{6}\right)=\frac{1}{2}$
$63=x^2+2x$
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