Trig Identities

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Last updated 1:31 AM on 4/30/26
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13 Terms

1
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sin²x

(1-cos2x)/2

2
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cos²x

(1+cos2x)/2

3
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sin²x + cos²x

1

4
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sec²x

tan²x + 1

5
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csc²x

1 + cot²x

6
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(d/dx) tanx

sec²x

7
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(d/dx) secx

secxtanx

8
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tan²x +1

sec²x

9
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tan²x

sec²x - 1

10
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1 - sin²x

cos²x

11
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a²+u²

u = asin(x)

12
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u² + a²

u = atan(x)

13
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u² - a²

u = asec(x)