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sum
sin(a + b)
sin a cos b + cos a sin b
cos(a + b)
cos a cos b - sin a sin b
tan(a + b)
tan a + tan b/ 1- tan a tan b
tan(a + b)
tan a - tan b/ 1 + tan a tan b
sin(a + b)
sin a cos b - cos a sin b
cos(a + b)
cos a cos b + sin a sin b
reciprocal identities
csc
1/sin
sec
1/cos
cot
1/ tan
tangent/cotangent identities
tan
sin/cos
cot
cos/sin
Pythagorean identities
1
sin² + cos ²
sec
1 + tan ²
csc
1 + cot²
cofunction identities
sin (pi/a -0) =
cos 0
cos (pi/a -0) =
sin 0
tan (pi/a -0) =
cot 0
negative angle identities
sin(-0)=
-sin 0
cos(-0)=
cos 0
tan(-0)=
-tan 0