$\frac{cot^2t}{cos\:t}=cot\:t\:csc\:t$
$\left(2x+3\right)\left(2x+6\right)$
$\frac{dy}{dx}=\:\frac{sen\left(x\right)}{cos\left(x\right)}$
$\frac{3^3+x-11}{x+1}$
$b+96=145$
$4a^2+100$
$\frac{5x^3}{x+1}.\frac{x^2+2x+1}{x^2+x}$
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