Applying the secant identity: $\displaystyle\sec\left(\theta\right)=\frac{1}{\cos\left(\theta\right)}$
Applying the tangent identity: $\displaystyle\tan\left(\theta\right)=\frac{\sin\left(\theta\right)}{\cos\left(\theta\right)}$
Simplify the fraction $\frac{\frac{1}{\cos\left(\theta\right)}}{\csc\left(\theta\right)\frac{\sin\left(\theta\right)}{\cos\left(\theta\right)}}$
Applying the cosecant identity: $\displaystyle\csc\left(\theta\right)=\frac{1}{\sin\left(\theta\right)}$
Simplify the fraction $\frac{\csc\left(\theta\right)}{\csc\left(\theta\right)}$ by $\csc\left(\theta\right)$
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