In a factory, utensils are manufactured in three plants, plant A, B and C. How many plates are manufactured by plant B if total plates are 3260?
The value of
\(
\left( \frac{1}{\sin \theta} + \frac{1}{\tan \theta} \right)
\left( \frac{1}{\sin \theta} - \frac{1}{\tan \theta} \right)
\)