$84^2-74^2$
$f ( x ) = \frac { 9 } { 3 x ^ { 2 } - 2 x }$
$-y^2dx+x\left(x+y\right)dy=0$
$\left(-1-3y\right)^{3}$
$\left(10x-2y\right)\left(10x+2y\right)$
$\int_0^{\frac{\pi}{6}}\left(sin^2\left(3x\right)cos^2\left(3x\right)\right)dx$
$\int\left(18x\right)sen\left(6x\right)dx$
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