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  1.     
  2.     _H_y_p_e_r_b_o_l_i_c _F_u_n_c_t_i_o_n_s
  3.     
  4.          cosh(x)
  5.          sinh(x)
  6.          tanh(x)
  7.          acosh(x)
  8.          asinh(x)
  9.          atanh(x)
  10.     
  11.     _D_e_s_c_r_i_p_t_i_o_n:
  12.     
  13.          These functions give the obvious hyperbolic functions.
  14.          They respectively compute the hyperbolic cosine, sine,
  15.          tangent, arc-cosine, arc-sine, arc-tangent.
  16.     
  17.     _S_e_e _A_l_s_o:
  18.     
  19.          cos, sin, tan, acos, asin, atan.
  20.     
  21.