$\left(x\right)\left(\sqrt{3}-\sqrt{x+3}\right)$
$\int\frac{4x-4}{x\left(x-2\right)}dx$
$10\:cm\:b\:20cm\:\sqrt{300}$
$\sec x\left(1+\cot x\right)=\sec x+\cos x$
$\int\frac{x}{x^2-14x+49}dx$
$\left(n-3\right)\left(n-26\right)$
$z^2-2z+1^2$
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