# Integral of sqrt(1+x^2)

Indefinite integral |
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integral sqrt(1 + x^2) dx = 1/2 (sqrt(x^2 + 1) x + sinh^(-1)(x)) + constant |

Alternate form of the integral |

1/2 sqrt(x^2 + 1) x + 1/2 log(sqrt(x^2 + 1) + x) + constant |

Expanded form of the integral |

1/2 sqrt(x^2 + 1) x + 1/2 sinh^(-1)(x) + constant |

Series expansion of the integral at x=0 |

x + x^3/6 – x^5/40 + x^7/112 + O(x^9) (Taylor series) |

Series expansion of the integral at x=-i |

(-1)^(floor(((3 pi)/2 – arg(x + i))/(2 pi))) (((-1)^(1/4) sqrt(x + i))/sqrt(2) – ((-1)^(3/4) (x + i)^(3/2))/(12 sqrt(2)) – (3 (-1)^(1/4) (x + i)^(5/2))/(160 sqrt(2)) + O((x + i)^(7/2))) + (-1/4 i (2 sqrt(2) sqrt(1 – i x) + pi) + (5 sqrt(1 – i x) (x + i))/(4 sqrt(2)) + (7 i sqrt(1 – i x) (x + i)^2)/(32 sqrt(2)) + (3 sqrt(1 – i x) (x + i)^3)/(128 sqrt(2)) + O((x + i)^4)) |