Math Identities - Trig

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Pre-Calculus

Last updated 12:21 PM on 10/26/23
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12 Terms

1
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tan(2x)

(2tan(x)) / (1 - tan²(x))

2
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tan(0.5x)

sin(x) / (1+cos(x))

3
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tan(x + y)

((tan(x) + tan(y))/(1 - tan(x)tan(y))

4
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tan(x - y)

((tan(x) - tan(y))/(1 + tan(x)tan(y))

5
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sin(2x)

2sin(x)cos(x)

6
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cos(2x)

cos²(x) - sin²(x)

7
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cos(0.5x)

(+/-) sqrt((1 + cos(x)) / 2)

8
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sin(0.5x)

(+/-) sqrt((1 - cos(x)) / 2)

9
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sin3x

3sin(x) - 4sin³(x)

10
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cos3x

4cos³(x) - 3cos(x)

11
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sec²(x)

tan²(x) + 1

12
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csc²(x)

cot²(x) + 1