$62\cdot22$
$3x^2=4x$
$sqrt\left(3+y^2\right)\cdot\:\:dx-y\cdot\:\:dy=x^2\cdot\:\:y\cdot\:\:dy$
$\left(5x-4\right)^2-\left(2x+3\right)^2$
$\frac{-4\sec\left(x\right)}{-\sin\left(x\right)}$
$\left(64x-5\right)^2$
$x^2+7+12$
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