A) \[3\text{ }sinh\text{ }x-4sin\,{{h}^{3}}x\]
B) \[3\text{ }sinh\text{ }x+4sin\,{{h}^{3}}x\]
C) \[4sin\,{{h}^{3}}x-3\text{ }sinh\text{ }x\]
D) None of these
Correct Answer: B
Solution :
\[\sinh 3x=3\sinh x+4{{\sinh }^{3}}x\]
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