>>858
 (2)
f(x) = 1/{(3/4) + (1/2 - x)^2}
  = (4/3)/{1 + (4/3)(1/2 - x)^2}
  = (4/3)Σ[k=0,∞] (-4/3)^k・(1/2 - x)^2k  ・・・・ 等比級数
収束条件は
 |公比| = (4/3)(1/2 - x)^2 < 1
 |1/2 - x| < (1/2)√3 = R,