$\frac{1-\sec^2d}{1-\csc^2d}$
$12x^2+5x-2=0$
$3x^2+12x=2$
$4x^3-y^3y'=0$
$-9d^3+2d-5d^3+3-20d$
$\int2x^2\cdot\cos\left(x^3-2\right)dx$
$5xy^7-y$
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