$2x^2+4x+xy=4$
$\frac{d}{dx}4x+7y-5x^2+1=0$
$2sin^22x+1$
$x\:^2\:+2x=8$
$-5\sin\left(3x\right)\sin\left(9x\right)$
$6\left(-\frac{3}{2}\right)\left(-5\right)$
$\frac{+27}{-3}+5+3-12$
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