$tanx=\frac{sin3x-sinx}{cos3x+cosx}$
$2.8w+5.6$
$\frac{2x^2x+1\:}{x-3}$
$n=49-36n^2$
$\left(p^5+\frac{3}{4}m\right)^2$
$c+d^2-18c-18d+65$
$\frac{x}{3}+\frac{y}{3}$
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