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trig identities
all the identities in the back of the book
13
Mathematics
12th Grade
12/14/2008
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Term
sin2u
 Definition
= 2sinxcosx
Term
cos2u
 Definition

= cos^2u - sin^2u

= 2cos^2u - 1

= 1 - 2sin^2u 
Term
tan2u
 Definition

   2tanu  

1 - tan^2u 
Term
sin(u/2)
 Definition

√(1-cosu)

√(2) 
Term
cos(u/2)
 Definition

√(1+cosu)

√(2) 
Term
tan(u/2)
 Definition

=(1-cosu)/sinu

=sinu/(1+cosu) 
Term
sin(A±B)
 Definition
sinAcosB ± cosAsinB
Term
cos(A±B)
 Definition
cosAcosB -/+ sinAsinB
Term
tan(A±B)
 Definition

tanA + tanB

1 - tanAtanB 
Term

sin(-u)

csc(-u)

cos(-u)

sec(-u)

tan(-u)

cot(-u) 

 Definition

-sinu

-cscu

cosu

secu

-tanu

-cotu 
Term
sin^2u
 Definition

1 - cos2u

2 
Term
cos^2u
 Definition

1 + cos2u

2 
Term
tan^2u
 Definition

1 - cos2u

1 + cos2u 
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