*www.DigitalDan.co.uk *E x1018   M x106   µ x10-6 ... *=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 ... * * 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(A)) 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)) eix=cos(x)+i sin(x) r(cos(x)+i sin(x))y=ry(cos(yx)+i sin(yx))