Find all values of the nonzero constant real numbers a, b, and c so that the vector field F = a cos( x + 2y ) cosh (c z) i + b cos (
x + 2y) cosh (c z) j + c sin(
x + 2y) sinh(c z) k is both and .
A) a = - , b = -2, c = 3
B) a = , b = 2, c = 2
C) a = - , b = -2, c =
± 2
D) a = , b = 2, c = ± 3
E) a = , b = -2, c = 9
Correct Answer:
Verified
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