A) (0, 2)
B) [0, 1]
C) (1, 2)
D) \[[2,\ \infty )\]
Correct Answer: D
Solution :
\[-1\le \cos \theta \le 1\] Þ \[=-\frac{1}{{{a}^{2}}}\] and \[{{\sec }^{2}}\theta \ge 1\]for \[\theta >\frac{\pi }{3}\] , \[\sec \theta \ge 2\] Þ \[{{\sec }^{2}}\theta \ge 4\]. \ Required interval \[=[2,\,\,\infty )\].
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