Mullins Carlson
12/13/2023 · Elementary School

\( y=\sinh (x) \)

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双曲正弦函数(sinh函数)定义为: \[ y = \sinh(x) = \frac{e^{x} - e^{-x}}{2} \] ### 性质 1. **奇函数**:\(\sinh(-x) = -\sinh(x)\) 2. **导数**:\(\frac{d}{dx} \sinh(x) = \cosh(x)\) 3. **积分**:\(\int \sinh(x)\,dx = \cosh(x) + C\) 4. **恒等式**:\(\cosh^{2}(x) - \sinh^{2}(x) = 1\) 5. **反函数**:\(\sinh^{-1}(x) = \ln\left(x + \sqrt{x^{2} + 1}\right)\) ### 图像 - 通过原点 \((0,0)\) - 当 \( x \) 增加时,\( \sinh(x) \) 增长得很快 - 当 \( x \) 减少时,\( \sinh(x) \) 减小得很快 ### 应用 - 描述悬挂链条的形状 - 分析波动和振动 - 电路理论中的应用 ### 与三角函数的关系 \[ \sinh(x) = -i \sin(i x) \] \[ \cosh(x) = \cos(i x) \] ### 总结 双曲正弦函数在数学和工程中非常重要,具有独特的性质和广泛的应用。

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