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The quantity 1 - tanh^2 x simplifies to which function?
Acoth^2 x
Bcosh^2 x
Ccsch^2 x
Dsech^2 x
Answer & Solution
Correct answer: D. sech^2 x
Dividing cosh^2 x - sinh^2 x = 1 by cosh^2 x gives 1 - tanh^2 x = sech^2 x.
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