$\frac{2}{\tan\left(x\right)+\cot\left(x\right)}=2\sin\left(x\right)\cos\left(x\right)$
$\left(6y+3z\right)^2$
$\left(5^2\cdot7^{-3}\right)^4$
$x3-127$
$\csc\left(\theta\:\right).\cos\left(\theta\:\right)=\cot\left(\theta\:\right)$
$\csc a=\left(\cot a+\tan a\right)\cos a$
$\frac{-28}{-1}$
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