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For every real x, cosh^2 x - sinh^2 x is equal to what?
A0
Bcosh 2x
C1
D-1
Answer & Solution
Correct answer: C. 1
Expanding with the exponential forms gives (e^(2x) + 2 + e^(-2x) - e^(2x) + 2 - e^(-2x))/4 = 1.
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