$\frac{3x+9}{2-x}$
$\int\frac{7}{\left(x+1\right)^3}dx$
$4\cos\:\left(x\right)\left(4+3\sin\:\left(x\right)\right)+3\sin\:\left(2x\right)=0$
$\left(21x^3+5+6x^5+12x+14x^4+20x^2\right):\left(2x^2+2x+3\right)$
$i^2+4i+4$
$sin\left(2x\right)+2sin\left(\frac{x}{2}\right)cos\left(\frac{x}{2}\right)=0$
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