$rs+4s$
$\left(2cosx+2isinx\right)^4$
$2-8\cos^2=0$
$\frac{1}{20}\left(6x^{5}y^{3}-73x^{7}y^{2}z\right)$
$-26450-1256$
$\frac{d}{dx}\left(9x^3-y^2-8=0\right)$
$\int\left(8csc^24xcot4x\right)dx$
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