$3x^2-9y^2$
$\tan\left(x\right)\left(2cos^2x-1\right)=0$
$\int x ^ { - 6 } d x$
$1370\::\:\left(-5\right)$
$\frac{1}{\cot\left(x\right)}-\frac{\sec\left(x\right)}{\csc\left(x\right)}=\cos\left(x\right)$
$x^2-8x+25$
$x^3+x^2-5x+8\:entre\:x^2-2x+1$
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