$\frac{d}{dx}\:\:\frac{5cos3x}{2sen3x}$
$\int\frac{\left(x+1\right)^2}{\left(x^2-1\right)}dx$
$- 4 x ^ { 2 } + 10 x + 24 = 0$
$\int\frac{2x}{x^2+x-6}dx$
$-55\cdot100$
$x^2-7x+2=c$
$\frac{4x^3-5}{3x+2}\:\:x\:\:4$
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