A) \[{{\sec }^{2}}x\]
B) \[-{{\sec }^{2}}\,\,\left( \frac{\pi }{4}-x \right)\]
C) \[{{\sec }^{2}}\,\,\left( \frac{\pi }{4}+x \right)\]
D) \[{{\sec }^{2}}\,\,\left( \frac{\pi }{4}-x \right)\]
E) None of these
Correct Answer: B
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