$xy-4y=0$
$\int_0^{\pi}\left(\left(8sen^2\left(t\right)\right)\right)dx$
$\int t^2\sin\left(bt\right)dt$
$y^2+9y+20$
$\left(3x+2y+3x+2y\right)^2$
$8.6x+2.2\left(2x-5\right)=54$
$\frac{\sec\left(50\right)-\tan\left(50\right)}{\cot\left(70\right)}$
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