$-3x^2-\:-3x^2-\:-3x^2$
$\sin^2x=4-2\cos^2x$
$6x+4y=22$
$\left(7\sqrt{2}\right)^2$
$2\left(1\right)-2+1$
$2-2-2+6\left(8-4\right)+2$
$\left(4s^{-1}\right)^2$
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