$\frac{dr}{d\theta}+r\tan\theta=9\sec\theta$
$6x^2+3a^2=12$
$\frac{y^3}{a}+2xy+9x^2$
$\frac{sin\left(t\right)-csc\left(t\right)}{sin\left(t\right)}$
$3m^2-mn+6mn-2n^2$
$\frac{x^3-0^2+x-0}{x^2+0x-4}$
$\frac{6y^2+11y+4}{3y^2+7y+4}$
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