$-n+4\left(4n+1\right)$
$3\:tan\:x=2\:sin\:2x$
$\int\frac{x^2+3x-4}{x^3+4x^2+4x}dx$
$36x^4-16y^8$
$\left(\frac{1}{2}x+7\right)\left(\frac{1}{2}x-12\right)$
$\left(b^4-29\right)^3$
$2csc^2x-2cot^2x$
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