$\tan^4\left(x\right)+\tan^2\left(x\right)$
$-3\cdot\left(x^{-3}\right)^{-2}$
$\frac{dy}{dx}\left(7+3x^x\right)$
$x^2+2\left(a+b\right)x+a^2+2ab+b$
$x^2-18x+87$
$sen\:x\:.\:sen\:\left(2x\right)-2cos^2x$
$\frac{d^9}{dx^9}\left(sin\left(x\right)\right)$
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