trig essential formulas
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Last updated 1:07 AM on 3/25/26
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14 Terms
1
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Cos(a-b)
CosAcosB+sinAsinB
2
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Sin(a-b)
Sina*cosb-cosa*sinb
3
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Cos(A+B)
CosA*cosB-sinA*sinB
4
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Cos(A-B)
CosA*cosB+sinA*sinB
5
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Sin(A/2)
+-rt((1-cosA)/2)
6
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Cos(A/2)
+-rt((1+cosA)/2)
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Tan(A/2)
+-rt((1-cosA)/(1+cosA))
8
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Cos(2A)
Cos²(A)-sin²(A) or 1-2sin²A or 2cos²A-1
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Sin(2A)
2sinAcosA
10
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Tan(2A)
(2tanA)/(1-tan²A)
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Tan(A+B)
(Tan(A)+Tan(B))/(1-tanAtanB)
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Tan(a-b)
(Tan(A)-Tan(B))/(1+tanAtanB)
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área of triangle
1/2*A*B*sinc
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