Unit 3 AP precalculus

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11 Terms

1
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Sin²x + cos²x =

1

2
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Sin(α ± β) =

sin(α)cos(β) ± cos(α)sin(β)

3
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Sin(2θ) =

2sin(θ)cos(θ)

4
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Cos(2θ) =

Cos²(θ) - sin²(θ)

5
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Cos(π/2 - θ) or Cos(θ - π/2) =

Sin(θ)

6
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sin(-θ) =

-sin(θ)

7
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Cos(-θ) =

Cos(θ)

8
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cos (a ± B) =

cos (a)cos(ß) -(±) sin(a)sin(B)

9
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how to express complex numbers with polar coordinate (r,θ)

rCos(θ) + iSin(θ)

10
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sin(π/3)

√3/2

11
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cos(π/3)

1/2