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Trigonometric Identities
The principal trig. identities.
22
Mathematics
11th Grade
12/13/2006
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Term
cscθ=?
 Definition
1/sinθ
Term
secθ=?
 Definition
1/cosθ
Term
cotθ=?
 Definition
1/tanθ
Term
tanθ=?
 Definition
sinθ/cosθ
Term
cotθ=?
 Definition
cosθ/sinθ
Term
sin2θ+cos 2 θ=?
 Definition
1
Term
tan2θ+1=?
 Definition
sec2θ
Term
cot2θ+1=?
 Definition
csc2θ
Term
sin(-θ)=?
 Definition
-sinθ
Term
cos(-θ)=?
 Definition
cosθ
Term
tan(-θ)=?
 Definition
-tanθ
Term
sin(θ+2π)=?
 Definition
sinθ
Term
cos(θ+2π)=?
 Definition
cosθ
Term
tan(θ+π)=?
 Definition
tanθ
Term
sin(π/2-θ)=?
 Definition
cosθ
Term
cos(π/2-θ)=?
 Definition
sinθ
Term
sin(α+β)=?
 Definition
sinαcosβ+cosαsinβ
Term
sin(α-β)=?
 Definition
sinαcosβ-cosαsinβ
Term
cos(α+β)=?
 Definition
cosαcosβ-sinαsinβ
Term
cos(α-β)=?
 Definition
cosαcosβ+sinαsinβ
Term
tan(α+β)=?
 Definition
tanα+tanβ/1-tanαtanβ
Term
tan(α-β)=?
 Definition
tanα-tanβ/1+tanαtanβ
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