Without using the trigonometric table, find the value of the following. \[ \begin{array}{l} \sec...

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Without using the trigonometric table, find the value of the following.
\[
\begin{array}{l}
\sec \left(90^{\circ}-\theta\right) \operatorname{cosec} \theta-\tan \left(90^{\circ}-\theta\right) \cot \theta \\
+\left(\cos ^{2} 35^{\circ}+\cos ^{2} 55^{\circ}\right) \\
\tan 5^{\circ} \tan 15^{\circ} \tan 75^{\circ} \tan 85^{\circ} \\
\end{array}
\]
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