$36a^8-1005^{18}$
$2\cos x-1=-4\cos x+2$
$\left(y+\sqrt{5}\right)^2$
$\left(x-7y\right)^2$
$\left(\frac{\cos\left(x\right)}{\sin\left(x\right)}-\frac{1}{\sin\left(x\right)}\right)^2=\frac{1-\cos\left(x\right)}{1+\cos\left(x\right)}$
$t^2-36$
$\frac{1296-x^4}{6-x}$
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