$f\left(x\right)=sen4x\:x$
$\left(9-3b^2\right)^2$
$8b-12+5-17b+7$
$12x^3-6x^2$
$a^2-18a+18$
$25y^6-9x^4$
$\frac{1}{\csc^2x\tan\left(x\right)}+\frac{1}{\sec^2x\tan\left(x\right)}$
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