A) \[{{R}^{+}},\,\left( -\frac{\pi }{2},\,\frac{\pi }{2} \right)\]
B) \[{{R}^{-}},\,\left( -\frac{\pi }{2},\,\frac{\pi }{2} \right)\]
C) \[R,\,\left( -\frac{\pi }{2},\,\frac{\pi }{2} \right)\]
D) \[R,\,\left( 0,\,\frac{\pi }{2} \right)\]
Correct Answer: C
Solution :
\[R,\,\left( -\frac{\pi }{2},\,\frac{\pi }{2} \right)\]
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