$\frac{a^3+g^3}{a+g}$
$\tan\alpha\sec\alpha=\frac{1}{1-\sen\alpha}-\frac{1}{1+\sen\alpha}$
$8x^2-y^2=1$
$btob$
$x^2-10xy$
$7y+2x+\left(7x+2y\right)y'\:=0$
$f\left(x\right)=\:x^2+x-6$
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