$x^3+5x^2-17x-21$
$-\left(x+1\right)+3\left(x-4\right)$
$sec^2x=1-tanx$
$\left(4x^5+6y^5\right)\left(4x^6-6y^5\right)$
$\left(2x\:+\:3\right)\:\left(2x\:+\:3\right)$
$\sqrt{a^2}\cdot b^2\cdot\sqrt{a^4}\cdot b$
$14-20+25-30-35$
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