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Trig Identities
Trigonametric Identities
15
Mathematics
11th Grade
02/25/2007
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Term
cos(u±v)
 Definition
cos(u)cos(v)(-/+)sin(u)sin(v)
Term
sin(u±v)
 Definition
sin(u)cos(v)±cos(u)sin(v)
Term
sin2(u)
 Definition
2sin(u)cos(u)
Term
cos2(u)
 Definition
cos^2(u)-sin^2(u)
Term
cos2(u)
 Definition
2cos^2(u)-1
Term
cos2(u)
 Definition
1-2sin^2(u)
Term
tan2(u)
 Definition
(2tan(u))/(1-tan^2(u))
Term
sin^2(u)
 Definition
(1-cos2(u))/2
Term
cos^2(u)
 Definition
(1+cos2(u))/2
Term
tan^2(u)
 Definition
(1-cos2(u))/(1+cos2(u))
Term
sin(u/2)
 Definition
±?{(1-cos(u))/2}
Term
cos(u/2)
 Definition
±?{(1+cos(u))/2}
Term
±?{(1-cos(u))/(1+cos(u))}
 Definition
tan(u/2)
Term
(1-cos(u))/(sin(u))
 Definition
tan(u/2)
Term
(sin(u))/(1+cos(u))
 Definition
tan(u/2)
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