Trig Identities

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Last updated 3:13 PM on 4/28/26
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15 Terms

1
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sin² x + cos² x

1

2
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sin²x

1 - cos²x

3
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cos²x

1 - sin²x

4
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tan²x + 1

sec²x

5
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tan²x

sec²x - 1

6
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sec²x - tan²x

1

7
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1 + cot²x

csc²x

8
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cot²x

csc²x - 1

9
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csc²x - cot²x

1

10
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sin2x

2sinxcosx

11
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cos2x

  • cos²x - sin²x

  • 2cos²x - 1

  • 1 - 2sin²x

12
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sin (a+b)

sinacosb + cosasinb

13
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sin (a-b)

sina cosb - cosa sinb

14
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cos (a+b)

cosa cosb - sina sinb

15
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cos (a-b)

cosa cosb + sina sinb