Trig Formulas

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Last updated 5:26 AM on 4/16/26
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17 Terms

1
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cos²x+sin²x

1

2
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1+tan²x

sec²x

3
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1+cot²x

csc²x

4
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1-sin²x

cos²x

5
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1-cos²x

sin²x

6
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-cos²x-sin²x

-1

7
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sin(2x)

2sin(x)cos(x)

8
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cos(2x)

cos²x-sin²x

9
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cos(2x) (alternate 1)

2cos²x-1

10
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cos(2x) (alternate 2)

1-2sin²x

11
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tan(2x)

2tan(x)/1-tan²(x)

12
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sin(a+b)

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

13
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sin(a-b)

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

14
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cos(a+b)

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

15
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cos(a-b)

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

16
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tan(a+b)

tan(a)+tan(b)/1-tan(a)tan(b)

17
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tan(a-b)

tan(a)-tan(b)/1+tan(a)tan(b)