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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SinAsinB

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)