*
=3.14159 1erg=10-7J ...*H He Li Be B C O N F Ne ...
*Th>Ra>Ac>Th>Ra>Rn>Po...
*A .- B ..- C -.-. D ..- E .
*Nord Norden Norte North
*
...*Beaufort F1 F2 F3 F4 F5 ...
*Cambrian Ordovician ...
*
*sin(x) cos(x2) tan(3x) ...
*sinh(x) cosh(x2) tanh(3x) ...
*=1+½+¼+... =1+1/2!+1/3!...
*
ex= sin-1x= ...*logxn= logexn= e2x= ...
*x2+y2=1 E=mc2 A=
r2 ...*x2+y2=1 E=mc2 A=
r2 ...*
*
DigitalDan.eu
(a/sin(A))=(b/sin(B))=(c/sin(C))=2r
sin(½A)=((s-b)(s-c)/bc)½ s=½(a+b+c)
cos(½A)=(s(s-a)/bc)½ s=½(a+b+c)
tan(½A)=((s-b)(s-c)/(s(s-a)))½ s=½(a+b+c)
tan(½(B-c))=((b-a)/(b+c))cot(½A)
sin(-A) = -sin(A)
cos(-A) = cos(A)
cosec(A) = 1/sin(A)
sec(A) = 1/cos(A)
cot(A) = 1/tan(A)
sin2(A) + cos2(A) = 1
cos2(A) = (1 + cos(2A))/2
sin2(A) = (1 - cos(2A))/2
sin(A)cos(A) = (sin(2A))/2
sin(A+B) = sin(A)cos(B) + cos(A)sin(B)
sin(A-B) = sin(A)cos(B) - cos(A)sin(B)
cos(A+B) = cos(A)cos(B) - sin(A)sin(B)
cos(A-B) = cos(A)cos(B) + sin(A)sin(B)
sec2(A) = 1 + tan2(A)
cosec2(A) = 1 + cot2(A)
sin(2A) = 2sin(A)cos(A)
cos(2A) = 2cos2(A) - 1
cos(2A) = 1 - 2sin2(A)
tan(2A) = (2tan(A))/(1-tan2(A))
tan(A+B) = (tan(A)+tan(B))/(1-tan(A)tan(B))
tan(A-B) = (tan(A)-tan(B))/(1+tan(A)tan(B))
sin(3A) = 3sin(A)-4sin3(A)
cos(3A) = 4cos3(A)-3cos(A)
tan(3A) = (3tan(A)-tan3(A))/(1-3tan
sin(2A) = 2tan(A)/(1+tan2(A))
cos(2A) = (1-tan2(A))/(1+tan2(A))
sin(A)+sin(B) = 2sin(½(A+B))cos(½(A-B))
sin(A)-sin(B) = 2cos(½(A+B))sin(½(A-B))
cos(A)+cos(B) = 2cos(½(A+B))cos(½(A-B))
cos(A)-cos(B) = 2sin(½(A+B))sin(½(B-A))
tan(A)+tan(B) = sin(A+B)/(cos(A)cos(B))
tan(A)-tan(B) = sin(A-B)/(cos(A)cos(B))
cos(A+B)+cos(A-B) = 2cos(A)cos(B)
cos(A-B)-cos(A+B) = 2sin(A)sin(B)
sin(x) = (x1/1!) - (x3/3!) + (x5/5!) - ...
cos(x) = (x0/0!) - (x2/2!) + (x4/4!) - ...
(d/dx) sin(x) = cos(x)
(d/dx) cos(x) = -sin(x)
(d/dx) tan(x) = sec2(x)
(d/dx) cot(x) = -cosec2(x)
(d/dx) sec(x) = sec(x)tan(x)
(d/dx) cosec(x) = -cosec(x)cot(x)
(d/dx) sin-1(x/a) = 1/(a2-x2)½
(d/dx) cos-1(x/a) = -1/(a2-x2)½
(d/dx) tan-1(x/a) = a/(a2+x2)
1/(x2+n2) =(1/n) tan-1(x/n) +c
sin(x) = -cos(x) +c
cos(x) = sin(x) +c
tan(x) = -ln(cos(x)) +c
cotan(x) = ln(sin(x)) +c
sec(x) = ln(sec(x) + tan(x)) +c
cosec(x) = log(tan(x/2)) +c
a(cos(ax)) = sin(ax) +c
a(sin(ax)) = -cos(ax) +c
a(sec2(ax)) = tan(ax) +c
1/(1-x2)½ = sin-1(x) +c
1/(1+x2) = tan-1(x)
= (sin(i)/sin(r))
= 1/(sin(c))