$49x^2+14xy+y^2$
$\left(5mn^2+3\right)^2$
$-\left(-1\right)+\left(-52\right)-4-\left(-21\right)$
$10-\left(-3-1\right)^2$
$\frac{dy}{dx}=y^2cos\left(4x\right)$
$\sin\left(90-y\right)+\sin\left(y\right)=1$
$cd-3cd+2cd$
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