sin30 = 1/2
sin45 =√2/2
sin60 =√3/2
cos30 =√3/2
cos45 =√2/2
cos60 = 1/2
tan30 =√3/3
tan45 = 1
tan60 =√3[ 1]
cot30 =√3
cot45 = 1
cot60 =√3/3
Extended data:
Two-angle sum formula
sin(A+B)= Sina cosb+cosAsinBsin(A-B)= Sina cosb-sinBcosA
cos(A+B)= cosa cosb-Sina sinb cos(A-B)= cosa cosb+Sina sinb
tan(A+B)=(tanA+tanB)/( 1-tanA tanB)tan(A-B)=(tanA-tanB)/( 1+tanA tanB)
ctg(A+B)=(ctgActgB- 1)/(ctg B+ctgA)ctg(A-B)=(ctgActgB+ 1)/(ctg B-ctgA)