Question

The value of ${\cos h}2x$ is.

• A. $\cosh^{2}x - \sinh^{2}x$
• B. $1 + 2{\cos h}^{2}x$
• C. $1 + 2{\sin h}^{2}x$
• D. None of these

Answer 1

Answer: (C)

$1 + 2{\sin h}^{2}x$

Answer 2

It is obvious.