$81n^2-252n+196$
$x2+4x=0$
$\lim_{x\to0}\left(\frac{3x\left(\cos\left(9x\right)-1\right)}{\sin\left(9x\right)-9x}\right)$
$12g^2+36gm+27g^2$
$x^4m+x^5+3yx$
$1.045^4$
$x^2+4x+4=25$
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