$3a^4+a^3+15a+5$
$\int\:\:\left(3cos2x-2sen3x\right)dx$
$5x^2-50x+30=0$
$\frac{dx}{dy}=2x-5y+2$
$\lim_{x\to0}\frac{\left(3e^x-3x-3\right)}{cos\left(x-1\right)}$
$6\left(2x+1\right)^2$
$8x^3+6x^2$
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