A) \[cos{{h}^{2}}x-sin{{h}^{2}}x\]
B) \[2\text{ }cos{{h}^{2}}x-1\]
C) \[1-2\text{ }sin{{h}^{2}}x\]
D) None of these
Correct Answer: B
Solution :
\[\cosh 2x=2{{\cosh }^{2}}x-1\]
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