$sen^4x\:+\:sen^2x\:=0$
$7=\frac{3x}{4}-2$
$\frac{dx}{dy}=\left(2-x\right)\left(1-x\right)$
$\left(a+2b\right)+\left(5+b\right)$
$\frac{d}{dx}\sqrt[4]{2x+3}$
$2x^2-6x+4=0$
$\left(2ab^2-3ac\right)^2$
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