$b+5<-13$
$\cos\left(y\right)dx+\sin\left(x\right)dy=0$
$\frac{d^2}{dx^2}\left(x^2\right)e^{3x}$
$3x^2y^2+9x^2y^2-18xy^2$
$\left(-7x^2+\frac{1}{3}y^2\right)^4$
$\left(2x+2y+y\right)^2$
$\cos\left(x\right)\left(\sec\left(x\right)+3\cot\left(x\right)\right)$
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