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The points (cosh t, sinh t) trace which curve in the plane?
ARight branch of x² - y² = 1
BA straight line y = x + 1
CThe circle x² + y² = 1
DUpper half of a parabola
Answer & Solution
Correct answer: A. Right branch of x² - y² = 1
Because cosh^2 t - sinh^2 t = 1, the points satisfy x² - y² = 1 with x at least 1, the right half of the unit hyperbola.
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