Two-angle summation formula SIN (a+b) = Sina COSB+COSA SINB SIN (a-b) = Sina COSB-SINB COSA (a+b) = Sina COSA COSB+ Sina Sinb Tanb (a+b) = (Tana+Tanb) (/kloc) -TANA tanB)tan(A-B)=(TANA-TANA)/( 1+TANA tanB)ctg(A+B)=(ctgActgB-655=-√(( 1-cosA)/2)cos(A/2)=√(( 1+cosA)/2)cos(A/2)=-√(( 1 +cosA)/2)tan(A/2)=√(( 1-cosA)/(( 1+cosA))tan(A/2)=-√(( 1-cosA)/((654438)

Sum difference product

2 sinA cosB = sin(A+B)+sin(A-B)2 cosA sinB = sin(A+B)-sin(A-B)2 cosA cosB = cos(A+B)-sin(A-B)-2 sinA sinB = cos(A+B)-cos(A-B)sinA+sinB = 2 sin((A+B)/ 2 cos((A-B)/2 cosA+cosB = 2 cos((A+B)/2)sin((A-B)/2)tanA+tanB = sin(A+B)/cosA cosB = sin(A+B)

Auxiliary angle formula

asina+bcosa=(a2+b2)^( 1/2)sin(a+t)

asina-bcosa=(a2+b2)^( 1/2)cos(a-t)