$y=\sqrt{\frac{\left(x-1\right)}{x^4-1}}$
$n^2+15n+54$
$cos\left(x\right)x\:^{-2}$
$5x\:-\:10\:=\:70$
$\int\frac{4}{x^4+2x^2+2}dx$
$2\cos^2\left(75^{\circ\:}\right)-1$
$-4+1+2+2$
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