$\tan\left(u\right)\csc^2\left(u\right)-\cot\left(u\right)\sec^2\left(u\right)=0$
$mx+2mc+3m$
$17+3+1+2+5+12+17$
$2x^2+3x-12$
$w^2+12w$
$3x-3x^2+3x^2-8x$
$\frac{d}{dx}y^4-4y^2=x^4-5x^2$
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