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cos(a+b)
cosAcosB - sinAsinB
cos(a-b)
cosAcosB + sinAsinB
sin(a+b)
sinAcosB + cosAsinB
sin(a-b)
sinAcosB - cosAsinB
tan(a+b)
(tanA + tanB) / (1 - tanAtan*B)
tan(a-b)
(tanA - tanB) / (1 + tanAtan*B)
cos 2a
cos²A - sin²A, also 2cos²A - 1, also 1 - 2sin²A
sin 2a
2sinAcosA
tan 2a
2tanA / (1 - tan²A)
cos(A/2)
sin(A/2)
tan(A/2)