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Trigonometry
Trig Identities
13
Mathematics
Undergraduate 1
02/25/2009
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Term
sin(A+B)=
 Definition
=sinAcosB+cosAsinB
Term
sin(A-B)=
 Definition
=sinAcosB-cosAsinB
Term
cos(A+B)=
 Definition
=cosAcosB-sinAsinB
Term
cos(A-B)=
 Definition
=cosAcosB+sinAsinB
Term
tan(A+B)=
 Definition
=(tanAtanB)
------------
1-tanAtanB
Term
tan(A-B)=
 Definition
=tanA-tanB
----------
1+tanAtanB
Term
sin2A=
 Definition
=2sinAcosA
Term
cos2A=
 Definition
=cos2A-sin2A
Term
tan2A=
 Definition
=2tanA
-------
1-tan2A
Term
cos2A=
 Definition
=2cos2A-1
Term
cos2A=
 Definition
=1-2sin2A
Term
sinA/2=
 Definition
=+-Square Root(1-cosA/2)
Term
cosA/2=
 Definition
=+-Square Root(1+cosA/2)
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