六、 双曲函数 Six, hyperbolic function
1. 双曲函数的定义、图形与特征 1. Definition of hyperbolic functions, graphics and features
[ 双曲函数定义 ] [Hyperbolic function definition]
函数 Function | 双曲正弦 Hyperbolic sine sh x sh x | 双曲余弦 Cosh ch x ch x | 双曲正切 Tanh th x th x | 双曲余切 Hyperbolic cotangent cth x cth x | 双曲正割 Sech sech x sech x | 双曲余割 Hyperbolic cosecant csch x csch x |
定义 Definition |
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[ 双曲函数的图形与特征 ] [Graphics and features hyperbolic function]
双曲正弦曲线 Hyperbolic sine curve 双曲余弦曲线 Hyperbolic cosine curve
曲线关于原点对称 . 曲线关于 y 轴对称 . Curve symmetric about the origin of the curve on the y-axis symmetry.
拐点 ( 同曲线对称中心 ): Inflection (with the curve center of symmetry): 顶点 ( 同极小值点 ): Vertex (with minimum points):
, 该点切线斜率为 1 The slope of a tangent point
双曲正切曲线 双曲余切曲线 Hyperbolic tangent curve hyperbolic cotangent curve
曲线关于原点对称 . 曲线关于原点对称 . Curve symmetrical about the origin curve symmetrical about the origin.
拐点 ( 同曲线对称中心 ): Inflection (with the curve center of symmetry): 不连续点 : Discontinuous points:
, 该点切线斜率为 1 渐近线 : The slope of a tangent point asymptote:
渐近线 : Asymptote:
双曲正割曲线 双曲余割曲线 Hyperbolic Secant Hyperbolic cosecant curve curve
曲线关于y轴对称. 曲线关于原点对称 . Curve symmetrical about the y-axis. Curve symmetrical about the origin.
顶点 ( 同极大点 ): Vertex (with maximum points): 不连续点 : Discontinuous points:
拐点 : Inflection point: 渐近线 : Asymptote:
渐近线 : Asymptote: