trigonometry identidy

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Last updated 12:45 AM on 4/13/26
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13 Terms

1
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Cos²x pid identity?

1-sin²x

2
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Sin²x

1-cos²x

3
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Sec²x

1+tan²x

4
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Csc²x

Cot²+1

5
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Sin(a+b)

Sin(a)cos(b)+cos(a)sin(b)

6
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Sin(a-b)

Sin(a)cos(b)-cos(a)sin(b)

7
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Cos(a+b)

Cos(a)cos(b)-sin(a)sin(b)

8
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Cos(a-b)

Cos(a)cos(b)+sin(a)sin(b)

9
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Cos2x (1)

Cos²x-sin²x

10
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Cos2x (2)

2cos²x-1

11
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Cos2x (3)

1-2sin²x

12
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Sin2x

2sinxcosx

13
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