$-x-2y^2-2x+5y^2$
$x^4+18x-19$
$6y^3+8y^2+2y$
$y\sin\left(x\right)dx-\cos\left(x\right)^2dy=0$
$-8\cos\left(x\right)+18\sin\left(x\right)=5\sqrt{2}$
$\frac{5x^3+4x+3x^2-7}{x+5}$
$\frac{\csc^20}{1+\tan^20}=\cot^20$
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