$-5n+5=45\:$
$\frac{1-\tan^2x}{1+\tan^2x}=1-\sin^2x$
$\log\left(2x-14\right)+\log\left(x-2\right)=2$
$c^2-3c+54$
$k^5\cdot k=k^5$
$y'=2t\:cos^2\:y$
$\frac{5^{\circ}30'}{10'}$
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