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test/bigdecimal/test_bigmath.rb

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    assert_equal(BigDecimal("0.823840753418636291769355073102514088959345624027952954058347023122539489"),

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                 atan(BigDecimal("1.08"), 72).round(72), '[ruby-dev:41257]')

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  end

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  def test_exp

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    assert_in_epsilon(Math::E, exp(BigDecimal("1"), N))

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    assert_in_epsilon(Math.exp(N), exp(BigDecimal("20"), N))

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    assert_in_epsilon(Math.exp(40), exp(BigDecimal("40"), N))

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    assert_in_epsilon(Math.exp(-N), exp(BigDecimal("-20"), N))

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    assert_in_epsilon(Math.exp(-40), exp(BigDecimal("-40"), N))

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  end

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  def test_log

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    assert_in_delta(0.0, log(BigDecimal("1"), N))

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    assert_in_delta(1.0, log(E(N), N))

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    assert_in_delta(Math.log(2.0), log(BigDecimal("2"), N))

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    assert_in_delta(2.0, log(E(N)*E(N), N))

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    assert_in_delta(Math.log(42.0), log(BigDecimal("42"), N))

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    assert_in_delta(Math.log(1e-42), log(BigDecimal("1e-42"), N))

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  end

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end

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