Double Angle Identities

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Math 3H Double angle identities for unit 10.

Geometry & Trigonometry

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4 Terms

1
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sin(2x) = 2 * sin(x) * cos(x)

sin(2x) = 2 * sin(x) * cos(x)

2
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cos(2x) = cos²(x) - sin²(x)

cos(2x) = cos²(x) - sin²(x)

3
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cos(2x) = 2 * cos²(x) - 1

cos(2x) = 2 * cos²(x) - 1

4
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cos(2x) = 1 - 2 * sin²(x)

cos(2x) = 1 - 2 * sin²(x)