$20-\left(-10\right)-4$
$\left(3x-1\right)^2-\left(4x+1\right)^2$
$\sqrt{d}+3f;\:d=9;\:f=3$
$-3\:.\:10\:+\:11\:-\:4\:$
$\left(ax+b\right)^2$
$\int2x^2cos\left(2x\right)dx$
$-70mn+25n^2$
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