$\frac{3x^2-12}{x+2}$
$\left(5x+x\right)\left(1-x\right)$
$+4-22-18-8-25$
$-2\left(x-2\right)$
$\left|-2+3\cdot\left(2-5\right)+3\right|-\left|\left(3-5+2\right)-2\cdot\left(3-4\right)\right|$
$1-2\sin\:^2\left(x\right)=\frac{1-tan^2x}{1+tan^2x}$
$2sinx+cscx=0$
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