$\left[+21+\left(17-15\right)-54\right]-\left\{11\right\}$
$\frac{dy}{dx}=\frac{y^3+x^3+xy^2}{xy^2}$
$3x+5>5x-2$
$-1:x<8$
$\int_0^1\left(\frac{x^3+9x^2+26x+24}{6x^2+42x+72}\right)dx$
$3tan^3x=tanx$
$\frac{senu}{cotu+cscu}-\frac{senu}{cotu-cscu}=2$
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