A) \[cos\text{ }ix=i\text{ }cosh\text{ }x\]
B) \[\tan ix=tanh\text{ }x\]
C) \[\sin \text{ }ix=i\text{ }\sin \text{ }x\]
D) \[cos\text{ }ix=cosh\text{ }x\]
Correct Answer: D
Solution :
\[cos\text{ }ix=cosh\text{ }x\]
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