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The sum sinh x + sinh y is the same as 2 sinh((x + y)/2) multiplied by what?
Asinh((x - y)/2)
Bcosh((x + y)/2)
Ccosh((x - y)/2)
Dtanh((x - y)/2)
Answer & Solution
Correct answer: C. cosh((x - y)/2)
The sum-to-product rule for sinh pairs the half-sum in sinh with the half-difference in cosh.
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