Trigonometric Identities

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6 Terms

1
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cos2(x) + sin2(x) =

1

2
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cos2(x) =

(1/2)[1 + cos(2x)]

3
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sin2(x) =

(1/2)[1 - cos(2x)]

4
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sec2(x) =

tan2(x) + 1

5
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tan2(x) =

sec2(x) - 1

6
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sin(2x) =

2cos(x)sin(x)