Trig Identities

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9 Terms

1
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sin(2x) =

2sin(x)cos(x)

2
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cos(2x) = (first form)

cos^2(x) - sin^2(x)

3
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cos(2x) = (second form)

2cos^2(x) - 1

4
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cos(2x) = (third form)

1 - 2sin^2(x)

5
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sin^2(x) + cos^2(x) =

1

6
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1 + tan^2(x) =

sec^2(x)

7
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1 + cot^2(x) =

csc^2(x)

8
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sin^2(x) = (half angle)

(1 - cos(2x))/2

9
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cos^2(x) = (half angle)

(1 + cos(2x))/2