$\frac{1+\cos\left(2y\right)}{\sin\left(2y\right)}=\frac{1}{\tan\left(y\right)}$
$\sec^2\left(80.103\right)$
$6+v+45$
$-7\:-\:\left(-12\right)\:-\:\left(\:+3\:\right)\:$
$\frac{-6}{r-4}=\frac{3}{r-10}$
$-3m-4m+5m-7m$
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