IDENTITIES AND EQUATIONS TRIG PRECALC
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Last updated 5:51 AM on 3/7/23
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12 Terms
1
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Sin(2x)
2sinxcosx
2
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Cos(2x)
Cos2x - Sin2x
3
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Tan(2x)
2Tanx / 1 - Tan2x
4
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Sin(x+y)
SinxCosy + CosxSiny
5
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Sin(x-y)
SinxCosy - CosxSiny
6
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Cos(x+y)
CosxCosy - SinxSiny
7
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Cos(x-y)
CosxCosy + SinxSiny
8
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tan(x+y)
Tanx + Tany / 1 - TanxTany
9
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Tan(x-y)
Tanx - Tany / 1 + TanxTany
10
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sin(x/2)
\+- root( 1 - cosx / 2)
11
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cos(x/2)
\+- root( 1 + cosx / 2)
12
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Tan(x/2)
1 - cosx / sinx OR sinx / 1 + cosx