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8 Terms

1
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cos(2x)

1-sin²x, 2cos²x-1, cos²x-sin²x

2
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sin(2x)

2sinxcosx

3
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trigettan

1=sin²x+cos²x

4
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sin(x+u)

sinxcosu+sinucosx

5
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sin(x-u)

sinxcosu-sinucosx

6
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cos(x+u)

cosxcosu-sinxsinu

7
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cos(x-u)

cosxcosu+sinxsinu

8
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asinx+bcosx

csin(x+v) där c=(a²+b²)^1/2

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