$x^2-y^2;x=2\:;\:y=-1$
$4senx\:=\:12\:sen^2\:x\:-1$
$6y+8>11$
$12ab\:-\:9ac\:$
$\frac{1}{16}\int\frac{cos^2x}{sen^2x}dx$
$\frac{sec^2a-1}{sina}=tana$
$\sin\left(7x^3+8x\right)$
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