double angles

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6 Terms

1
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Sin2u

𝑠𝑖𝑛 2𝑢 = 2 𝑠𝑖𝑛 𝑢 𝑐𝑜𝑠 𝑢

2
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Cos2u

𝑐𝑜𝑠 2𝑢 = 𝑐𝑜𝑠²𝑢 - 𝑠𝑖𝑛²𝑢

𝑐𝑜𝑠 2𝑢 = 2𝑐𝑜𝑠²𝑢 - 1

𝑐𝑜𝑠 2𝑢 = 1 - 2𝑠𝑖𝑛²𝑢

3
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Tan2u

<img src="blob:null/daf95f51-bd32-441b-ba30-c2c6ece8f179">
4
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Sin4x

sin4x = 2 sin2x cos2x

5
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Sin6x

sin6x = 2 sin3x cos3x

  • same as 4 but with 3’s

6
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Cos4x

cos4x = cos²2x sin²2x