$3\left(2a+b\right)-4a\left(b+c\right)-2c\left(a-b\right)$
$\left(x^2+a^2\right)\left(x^2-b^2\right)$
$( 1 - 2 r ) ^ { 3 }$
$858\:+\:370$
$-3+4-7-6-2+5\:+1$
$x^2+13x-48$
$\lim_{x\to4}\left(1-sin^2y\right)^{\frac{1}{2}}$
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