Angle Identities
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Double Angle Formula for Cosine 3
cos(2a)= 1-2sin^2(a)
Double Angle Formula for Cosine 2
cos(2a)= 2cos^2(a)-1
Double Angle Formula for Cosine 1
cos(2a)= cos^2(a)-sin^2(a)
Angle Sum Identity for Cosine
cos(a+B)= cos(a)cos(B)-sin(a)sin(B)
Angle Difference Identity for Cosine
cos(a-B)= cos(a)cos(B)+sin(a)sin(B)
Double Angle Formula for Sine
sin(2a)= 2sin(a)cos(a)
Angle Sum Identity for Sine
sin(a+B)= sin(a)cos(B)+cos(a)sin(B)
Angle Difference Identity for Sine
sin(a-B)= sin(a)cos(B)-cos(a)sin(B)