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Trigonometric Forumlas
sin, cos, tan, sec, csc, and cot
15
Mathematics
10th Grade
02/08/2007
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Cards

Term
sin2A
 Definition
2sinAcosA
Term
cos2X (3 of them)
 Definition
cos2X-sin2X
2cos2X-1
1-2sin2X
Term
tan2B
 Definition
2tanB
1-tan2B
Term
sin(X/2)
 Definition
±sqrt[(1-cosX)/2]
Term
cos(B/2)
 Definition
±sqrt[(1+cosB)/2]
Term
tan(A/2) (3 of them)
 Definition
±sqrt[(1-cosA)/(1+cosA)]

1-cosA
sinA

sinA
1+cosA
Term
sin(A+B)
 Definition
sinAcosB+cosAsinB
Term
cos(X-Y)
 Definition
cosXcosY+sinXsinY
Term
tan(C+D)
 Definition
tanC+tanD
1-tanCtanD
Term
cos(A+B)
 Definition
cosAcosB-sinAsinB
Term
sin(X-Y)
 Definition
sinXcosY-cosXsinY
Term
tan(A-B)
 Definition
tanA-tanB
1+tanAtanB
Term
sin2X
 Definition
1-cos2X
2
Term
cos2R
 Definition
1+cos2R
2
Term
tan2W
 Definition
1-cos2W
1+cos2W
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