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15 terms

trig equations

STUDY
PLAY
cos(A-B)
cosAcosB+sinAsinB
cos(A+B)
cosAcosB-sinAsinB
sin(A-B)
sinAcosB-cosAsinB
sin(A+B)
sinAcosB+cosAsinB
tan(A+B)
(tanA+tanB)/(1-tanAtanB)
tan(A-B)
(tanA-tanB)/(1+tanAtanB)
sin2A
2sinAcosA
cos2A (all three)
cos²A-sin²A, 1-2sin²A, 2cos²A-1
tan2A
(2tanA)/(1-tan²A)
cos²A
1/2(1+cos2A)
sin²A
1/2(1-cos2A)
sin(1/2)x
+/-root(1/2(1-cosx))
cos(1/2)x
+/-root(1/2(1+cosx))
tan(1/2)x
sinx/(1+cosx) or 1-cosx/sinx
Acosx+Bsinx=Ccos(x-D) when
C=root(A²+B²), cos D=A/C, sin D=B/C