$12x^2+28x+15x+35$
$\frac{\cot\left(x\right)}{1+csc\:x}=-\frac{csc\:x}{1+csc\:x}$
$\frac{d}{dy}2xy-x^2-2y^2+3x+4$
$4x^3y^4z^3+2^2y^3z-6x^2y^3z^2$
$m=p+prt\:for\:t$
$\left(x-3\right)potencia4$
$3sin\theta\:\:cos^2\theta\:-sin^3\theta\:$
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