vb除了有基本三角函数外

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1、VB除了有基本三角函数外,还可自定义其它三角函数函数由基本函数导出之公式 Secant（正割）Sec(X)=1/Cos(X) Cosecant（余割）Cosec(X)=1/Sin(X) Cotangent（余切）Cotan(X)=1/Tan(X) InverseSine （反正弦）Arcsin(X)=Atn(X/Sqr(-X*X+1)) InverseCosine （反余弦）Arccos(X)=Atn(-X/Sqr(-X*X+1))+2*Atn(1) InverseSecant （反正割）Arcsec(X)=Atn(X/Sq

2、r(X*X-1))+Sgn((X)-1)*(2*Atn(1)) InverseCosecant （反余割）Arccosec(X)=Atn(X/Sqr(X*X-1))+(Sgn(X)-1)*(2*Atn(1)) InverseCotangent （反余切）Arccotan(X)=Atn(X)+2*Atn(1) HyperbolicSine （双曲正弦）HSin(X)=(Exp(X)-Exp(-X))/2  HyperbolicCosine （双曲余弦）HCos(X)=(Exp(X)+Exp(-X))/2 HyperbolicT

3、angent （双曲正切）HTan(X)=(Exp(X)-Exp(-X))/(Exp(X)+Exp(-X)) HyperbolicSecant （双曲正割）HSec(X)=2/(Exp(X)+Exp(-X)) HyperbolicCosecant（双曲余割）HCosec(X)=2/(Exp(X)-Exp(-X)) HyperbolicCotangent（双曲余切）HCotan(X)=(Exp(X)+Exp(-X))/(Exp(X)-Exp(-X)) InverseHyperbolicSine（反双曲正弦）HArcsin(X)

4、=Log(X+Sqr(X*X+1)) InverseHyperbolicCosine（反双曲余弦）HArccos(X)=Log(X+Sqr(X*X-1)) InverseHyperbolicTangent（反双曲正切）HArctan(X)=Log((1+X)/(1-X))/2 InverseHyperbolicSecant（反双曲正割）HArcsec(X)=Log((Sqr(-X*X+1)+1)/X) InverseHyperbolicCosecantHArccosec(X)=Log((Sgn(X)*Sqr(X*X+1)+1

5、)/X) InverseHyperbolicCotangent （反双曲余切）HArccotan(X)=Log((X+1)/(X-1))/2 ‘---------------------------------------------------------------------------------------------------------------分数近似的正弦函数（算起来方便）sin(0)=0/1sin(1)=1/57sin(2)=3/86sin(3)=1/19sin(4)=3/43sin(5)=2/23s

6、in(6)=7/67sin(7)=5/41sin(8)=11/79sin(9)=5/32sin(10)=4/23sin(11)=4/21sin(12)=16/77sin(13)=9/40sin(14)=15/62sin(15)=22/85sin(16)=8/29sin(17)=19/65sin(18)=17/55sin(19)=14/43sin(20)=13/38sin(21)=19/53sin(22)=3/8sin(23)=34/87sin(24)=24/59sin(25)=30/71sin(26)=32/73sin(27

7、)=5/11sin(28)=23/49sin(29)=16/33sin(30)=1/2sin(31)=17/33sin(32)=53/100sin(33)=6/11sin(34)=52/93sin(35)=39/68sin(36)=10/17sin(37)=3/5sin(38)=8/13sin(39)=17/27sin(40)=9/14sin(41)=21/32sin(42)=2/3sin(43)=15/22sin(44)=66/95sin(45)=70/99sin(46)=41/57sin(47)=49/67sin(48)

8、=55/74sin(49)=40/53sin(50)=36/47sin(51)=7/9sin(52)=26/33sin(53)=4/5sin(54)=72/89sin(55)=77/94sin(56)=63/76sin(57)=26/31sin(58)=67/79sin(59)=6/7si