trig identities
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17 Terms
1
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Sin(a+b)
SinAcosB+ cosAsinb
2
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Cos(a+b)
CosAcosB-sinAsinB
3
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Tan(a+b)
TanA+tanB/1-tanAtanB
4
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Tan(a-b)
TanA-tanB/tanAtanB+1
5
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SinAcosB
0.5(sin(a+b)+sin(a-b))
6
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CosAsinB
0.5(sin(a+b)-sin(a-b))
7
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CosAcosB
0.5(cos(a+b)+cos(a-b))
8
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SinAsinB
0.5(cos(a-b)-cos(a+b))
9
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Sec²x
tan²x+1
10
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Csc²x
Cot²x+1
11
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Sin(x/2)
+-sqrt((1-cosx)/2)
12
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Cos(x/2)
+-sqrt((1+cosx)/2)
13
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Tan(x/2)
+-sqrt((1-cosx)/(1+cosx))
14
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SinA +sinB
2sin((a+b)/2)cos((a-b)/2)
15
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SinA-sinB
2cos((a+b)/2)sin((a-b)/2)
16
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CosA +cosB
2cos((a+b)/2)cos((a-b)/2)
17
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CosA-cosB
-2sin(a+b)/2)sin((a-b)/2)
Note 
Flashcards (100)