AP Precalc Trig Identities

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Last updated 5:22 AM on 4/15/26
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11 Terms

1
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sin²x+cos²x

1

2
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1+tan²x

sec²x

3
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1+cot²x

csc²x

4
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sin(2x)

2 sin(x) cos(x)

5
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cos(2x) (basic)

cos²x-sin²x

6
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cos(2x) (cos only)

2 cos²x-1

7
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cos(2x) (sin only)

1-2 sin²x

8
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tan (x)

sin x / cos x

9
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cot (x)

cos x / sin x

10
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sec (x)

1 / cos x

11
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csc (x)

1 / sin x