formuli trigonometrice

matematica

cos(A+B)=cosAcosB-senAsenB

cos(A-B)=cosAcosB+senAsenB 535f55f

cos 2A)=cos²A-sen²A

sen A+B)=senAcosB+cosAsenB

sen A-B)=senAcosB-cosAsenB

sen2A=2senAcosA

tg A+B)=(tgA+tgB)/(1-tgAtgB)

tg A-B)=(tgA-tgB)/(1+tgAtgB)

tg(2A)=(2tgA)/(1-tg²A)

log_a(BC)=log_aB+log_aC

log_a(B/C)=log_aB-log_aC

log_a(B^M/N)=(M/N)log_aB

log_a(1/A)=-log_aA

log_bX=log_a(X)/log_a(b)

P_n=n!

D_n,k= n!/(n-k)!

C_n,k=D_n,k/P_k=n!/k!(n-k)!

P(aUb) = P(a)+P(b)-P(a∩b)

P(a∩b) = P(b)P(a|b)=P(a)P(b|a)

P(a|b)=P(a∩b)/P(b)

(cos +isen (cos +isen [cos( )+isen(

(cos +isen (cos +isen [cos( )+isen(

cos +isen )]ⁿ= ⁿ[cos(n )+isen(n

cos +isen )]^1/n= ^1/n[cos( /n+2πk/n)+ isen( /n+2πk/n)]