| 函数 |
派生的等效公式 |
| secant(正割) |
sec(x) = 1 / cos(x) |
| cosecant(余割) |
cosec(x) = 1 / sin(x) |
| cotangent(余切) |
cotan(x) = 1 / tan(x) |
| inverse sine(反正弦) |
arcsin(x) = atn(x / sqr(-x * x + 1)) |
| inverse cosine(反余弦) |
arccos(x) = atn(-x / sqr(-x * x + 1)) + 2 * atn(1) |
| inverse secant(反正割) |
arcsec(x) = atn(x / sqr(x * x - 1)) + sgn((x) -1) * (2 * atn(1)) |
| inverse cosecant(反余割) |
arccosec(x) = atn(x / sqr(x * x - 1)) + (sgn(x) - 1) * (2 * atn(1)) |
| inverse cotangent(反余切) |
arccotan(x) = atn(x) + 2 * atn(1) |
| hyperbolic sine(双曲正弦) |
hsin(x) = (exp(x) - exp(-x)) / 2 |
| hyperbolic cosine(双曲余弦) |
hcos(x) = (exp(x) + exp(-x)) / 2 |
| hyperbolic tangent(双曲正切) |
htan(x) = (exp(x) - exp(-x)) / (exp(x) + exp(-x)) |
| hyperbolic secant(双曲正割) |
hsec(x) = 2 / (exp(x) + exp(-x)) |
| hyperbolic cosecant(双曲余割) |
hcosec(x) = 2 / (exp(x) - exp(-x)) |
| hyperbolic cotangent(双曲余切) |
hcotan(x) = (exp(x) + exp(-x)) / (exp(x) - exp(-x)) |
| inverse hyperbolic sine(反双曲正弦) |
harcsin(x) = log(x + sqr(x * x + 1)) |
| inverse hyperbolic cosine(反双曲余弦) |
harccos(x) = log(x + sqr(x * x - 1)) |
| inverse hyperbolic tangent(反双曲正切) |
harctan(x) = log((1 + x) / (1 - x)) / 2 |
| inverse hyperbolic secant(反双曲正割) |
harcsec(x) = log((sqr(-x * x + 1) + 1) / x) |
| inverse hyperbolic cosecant(反双曲余割) |
harccosec(x) = log((sgn(x) * sqr(x * x + 1) +1) / x) |
| inverse hyperbolic cotangent(反双曲余切) |
harccotan(x) = log((x + 1) / (x - 1)) / 2 |
| 以 n 为底的对数 |
logn(x) = log(x) / log(n) |