$2a-3ab+5ab+7a$
$sin\left(x\right)+x+sin\left(2x\right)+x$
$1yb$
$3x^2+3x-2x-2$
$\cos x-\cos^2x=\cos x\sin^2x$
$\left(-3\right)-\left(-16\right)$
$\frac{dy}{dx}=\frac{-2x+1}{y+2}$
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