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With tanh x = 1/2 and tanh y = 1/3, find tanh(x + y).
A1/7
B5/6
C6/7
D5/7
Answer & Solution
Correct answer: D. 5/7
tanh(x + y) = (1/2 + 1/3)/(1 + 1/6) = (5/6)/(7/6) = 5/7.
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