Trig Identities: Sum, Difference, Double Angle, Half Angle, Power Reducing
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sin(a + b)
sin(a)cos(b) + cos(a)sin(b)
sin(a - b)
sin(a)cos(b) - cos(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)
cos²a
1+cos2a ------- 2
csc²a
1+cot²a
sec²a
1+tan²a
cos (2a)
1- 2sin²(a)
sin²a
1-cos2a ------- 2
tan²a
1-cos2a ------- 1+cos2a
cos (2a)
2cos²(a)-1
sin(2a)
2sin(a)cos(a)
tan(2a)
2tan(a) ----------- 1 - tan²(a)
cos(a - b)
cos(a)cos(b) + sin(a)sin(b)
cos(a + b)
cos(a)cos(b) - sin(a)sin(b)
cos (2a)
cos²(a) - sin²(a)
2tan(a) ----------- 1 + tan²(a)
nothing