$\frac{d}{dx}\left(\sin x-\cos y-3=0\right)$
$9c^2-12cd+4d^2$
$2\csc\left(x\right)^2-\csc\left(x\right)^4=1-\cot\left(x\right)^4$
$5^2\cdot5^2$
$\frac{4}{s^2+2s+1}$
$14-12+14+1-9-1$
$4\left(r+6\right)+7+3e+r+2e-12+2e$
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