$k=\left(2\sin\left(x\right)-2\cos\left(x\right)\right)^2+8\sin\left(x\right)\cos\left(x\right)$
$\lim_{x\to a}\left(\frac{x^2+ax-2a^2}{x^2+a^2}\right)$
$\left(x+y\right)\left(x+y\right)$
$\left(7a^2+2b\right)\left(7a^2-2b\right)$
$\int\frac{7}{8}e^xdx$
$f\left(x\right)=\frac{\left(3x^2+2x-6\right)\sqrt{x^2+x+1}}{x\left(x-2\right)\left(x+3\right)}$
$\frac{x^4+x^2+2}{x-2}$
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