A) \[\left( \frac{{{I}_{0}}}{8} \right){{\sin }^{2}}2\theta \]
B) \[\left( \frac{{{I}_{0}}}{4} \right){{\sin }^{2}}2\theta \]
C) \[\left( \frac{{{I}_{0}}}{2} \right){{\cos }^{4}}\theta \]
D) \[{{I}_{0}}{{\cos }^{4}}\theta \]
Correct Answer: A
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