The value of \( \sum_{r=1}^{18} \cos ^{2}(5 r)^{\circ} \), where \( x^{\circ} \) denotes the \( ...
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0The value of \( \sum_{r=1}^{18} \cos ^{2}(5 r)^{\circ} \), where \( x^{\circ} \) denotes the \( x \) degrees, is equal to
(a) 0
(b) \( \frac{7}{2} \)
(c) \( \frac{17}{2} \)
(d) \( \frac{25}{2} \)
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