$\frac{x^3+2x+1}{x^2-x+3}$
$3x^2+4y\frac{dy}{dx}=7$
$2y'+4y=2x$
$10-20+300-40+50-70$
$\int\frac{sen\:bx}{1-cos\:bx\:}dx$
$2^6\cdot2^2$
$55\cdot58$
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