Question: Hyperbolic functions are useful in solving differential equations (Section 7.9). Show that the functions y = A sinh kx and y = B cosh kx,

Hyperbolic functions are useful in solving differential equations (Section 7.9). Show that the functions y = A sinh kx and y = B cosh kx, where A, B, and k are constants, satisfy the equation y"(x) - k²y(x) = 0.

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