$3y+x-3\left(4+x\right)-5y+2$
$\frac{d}{dx}\:y^{4\:}-2x^2+\:8xy^2+9\:=0$
$\int\left(\frac{7x^2-6x}{x^2+4}\right)dx$
$\left(\frac{x^2}{2}-2\right)^2$
$2\tan^2x-3=3$
$\int_0^1\left(9x^4-3x^5+2x^2-5e^x\right)dx$
$\int\frac{y+4}{y^2+4}dy$
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